src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupRLE.java (29 lines):
	- line 117: // TODO make specialized version that ignore rl if rl == 0.
	- line 120: // TODO make specialized version that ignore ru if ru == nRows.
	- line 158: // TODO make specialized version that ignore rl if rl == 0.
	- line 161: // TODO make specialized version that ignore ru if ru == nRows.
	- line 200: // TODO make specialized version that ignore rl if rl == 0.
	- line 203: // TODO make specialized version that ignore ru if ru == nRows.
	- line 236: // TODO make specialized version that ignore rl if rl == 0.
	- line 239: // TODO make specialized version that ignore ru if ru == nRows.
	- line 274: // TODO: add support for FORRLE if applicable case.
	- line 287: // TODO: add support for FORRLE if applicable case.
	- line 322: // TODO create rle from boolean list.
	- line 343: // TODO add cache blocking
	- line 358: // TODO make specialized version that ignore rl if rl == 0.
	- line 361: // TODO make specialized version that ignore ru if ru == nRows.
	- line 406: // TODO add cache blocking
	- line 417: // TODO make specialized version that ignore rl if rl == 0.
	- line 420: // TODO make specialized version that ignore ru if ru == nRows.
	- line 447: // TODO add cache blocking
	- line 458: // TODO make specialized version that ignore rl if rl == 0.
	- line 461: // TODO make specialized version that ignore ru if ru == nRows.
	- line 489: // TODO add cache blocking
	- line 500: // TODO make specialized version that ignore rl if rl == 0.
	- line 503: // TODO make specialized version that ignore ru if ru == nRows.
	- line 530: // TODO add cache blocking
	- line 541: // TODO make specialized version that ignore rl if rl == 0.
	- line 544: // TODO make specialized version that ignore ru if ru == nRows.
	- line 687: for(int r = rl; r < ru; r++) { // TODO move rl and ru to innermost loop.
	- line 699: // TODO make specialized version that ignore cu if cu == nRows.
	- line 771: // TODO make specialized version that ignore cu if cu == nRows.


src/main/java/org/apache/sysds/runtime/lineage/LineageCache.java (22 lines):
	- line 115: //TODO need to also move execution of compensation plan out of here
	- line 183: else { //TODO handle locks on gpu objects
	- line 250: //TODO: handling of recursive calls
	- line 386: //TODO: reuse only those UDFs which are part of reusable instructions
	- line 393: //TODO: support multi-return UDFs
	- line 395: //TODO: trace all UDFs
	- line 455: //TODO: dedicated stats for federated reuse
	- line 530: //TODO problematic as after probe the matrix might be kicked out of cache
	- line 595: //TODO why do we need both of these public put methods
	- line 640: // TODO: gpu multi-return instructions
	- line 780: // TODO: Cache sparse pointers
	- line 918: //FIXME: if boundLI is for a MultiReturnBuiltin instruction
	- line 942: //TODO: trace all UDFs
	- line 977: //TODO: maintain statistics, lineage estimate
	- line 1078: //FIXME: different o/p datatypes for MultiReturnBuiltins.
	- line 1165: // TODO: Handling of func/SB cache entries for Spark and GPU
	- line 1272: //TODO: All other relevant instruction types.
	- line 1354: //TODO: cm, variance
	- line 1356: //TODO: support other PBuiltin ops
	- line 1393: nflops = 0; //FIXME: this method will be deprecated
	- line 1412: //TODO: Replace with generic type
	- line 1415: //FIXME: Replace getLineageItem with get/getOrCreate to avoid creating a new LI object


src/main/java/org/apache/sysds/runtime/controlprogram/context/SparkExecutionContext.java (16 lines):
	- line 128: //TODO unify memory management for CP, par RDDs, and potentially broadcasts
	- line 271: //TODO if spark context passed in from outside (mlcontext), we need to clean this up at the end
	- line 478: // TODO: Is that a bug because it triggers extra file reading? rdd is needed only for the first case
	- line 533: // TODO implement hadoop read write for tensor
	- line 548: // TODO use fromFile instead of false and true
	- line 558: // TODO implement hadoop read write for tensor
	- line 564: // TODO: TensorMarket?
	- line 566: // TODO support other Input formats
	- line 580: * FIXME: currently this implementation assumes matrix representations but frame signature
	- line 672: //TODO: synchronize
	- line 978: // TODO rows and columns for matrix characteristics
	- line 1309: // TODO special case single block
	- line 1311: // TODO asynchronous allocation
	- line 1338: // TODO sparse copy
	- line 1340: // TODO keep track of nnz
	- line 1343: // TODO post-processing output tensor (nnz, sparsity)


src/main/java/org/apache/sysds/runtime/lineage/LineageRewriteReuse.java (15 lines):
	- line 84: // TODO extend recompiler to allow use without explain output
	- line 128: DMLScript.EXPLAIN = et; //TODO can't change this here
	- line 150: // TODO: For now assumption is that a single column is being appended in a loop
	- line 236: //TODO: support for block of rows
	- line 416: //TODO: support for block of rows
	- line 462: //TODO: support for block of rows
	- line 543: //TODO: support for block of rows
	- line 600: //TODO: support for block of rows
	- line 657: //TODO: support for block of rows
	- line 711: * TODO: Generalize for all cases and move to compiler
	- line 913: //TODO: support nary cbind
	- line 944: //TODO: support nary cbind
	- line 1156: * TODO: generalized but robust applicability function
	- line 1200: //TODO: delta with more than one column
	- line 1239: // TODO extend recompiler to allow use without explain output


src/main/java/org/apache/sysds/runtime/data/LibTensorAgg.java (13 lines):
	- line 51: // TODO more conditions depending on operation
	- line 64: // TODO filter empty input blocks (incl special handling for sparse-unsafe operations)
	- line 97: // TODO change to sparse if worth it
	- line 108: // TODO implement for other optypes
	- line 134: // TODO support indexfn that are not reduce all
	- line 135: // TODO support for all shapes
	- line 199: // TODO handle different index functions
	- line 202: // TODO other aggregations
	- line 213: //TODO special handling for mean where the final aggregate operator
	- line 224: // TODO: SparseBlock
	- line 230: //TODO switch to no-op nnz meta data once available
	- line 271: // TODO maybe merge this, and other parts, with `LibMatrixAgg`
	- line 298: //TODO recompute non-zeros of partial result


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixCUDA.java (11 lines):
	- line 503: // For sparse TSMM, invoke matmult (TODO: possible performance improvement)
	- line 1163: // TODO:
	- line 1178: // TODO: Potential to optimize
	- line 1204: // TODO: Performance optimization: Call cublasDaxpy if(in.getNumRows() == 1 || in.getNumColumns() == 1)
	- line 1305: Pointer A = getDensePointer(gCtx, in, instName); // TODO: FIXME: Implement sparse binCellSparseScalarOp kernel
	- line 1392: Pointer A = getDensePointer(gCtx, in1, instName); // TODO: FIXME: Implement sparse binCellSparseOp kernel
	- line 1393: Pointer B = getDensePointer(gCtx, in2, instName); // TODO: FIXME: Implement sparse binCellSparseOp kernel
	- line 1496: Pointer srcPtr = getDensePointer(gCtx, src, instName); // TODO: FIXME: Implement sparse kernel
	- line 1612: // TODO: Implement sparse-dense matrix cublasDgeam kernel
	- line 1638: // TODO: to implement the transposed + dgeam for sparse matrices, they need to be converted to csc, which is effectively a tranpose
	- line 2680: // TODO  : Find a way to assign bTobj directly to the output and set the correct flags so as to not crash


src/main/java/org/apache/sysds/runtime/meta/TensorCharacteristics.java (11 lines):
	- line 31: // TODO move block size to `ConfigurationManager`
	- line 222: // TODO Auto-generated method stub
	- line 228: // TODO Auto-generated method stub
	- line 234: // TODO Auto-generated method stub
	- line 240: // TODO Auto-generated method stub
	- line 246: // TODO Auto-generated method stub
	- line 252: // TODO Auto-generated method stub
	- line 258: // TODO Auto-generated method stub
	- line 264: // TODO Auto-generated method stub
	- line 270: // TODO Auto-generated method stub
	- line 276: // TODO Auto-generated method stub


src/main/java/org/apache/sysds/runtime/data/TensorBlock.java (11 lines):
	- line 230: //TODO perf, do not fill, instead save schema
	- line 261: // TODO Auto-generated method stub
	- line 267: // TODO Auto-generated method stub
	- line 273: // TODO Auto-generated method stub
	- line 279: // TODO Auto-generated method stub
	- line 284: // TODO Auto-generated method stub
	- line 517: // TODO perf
	- line 573: // TODO perf
	- line 660: //TODO perf bits instead of bytes
	- line 813: // FIXME readUTF is not supported for CacheDataInput
	- line 859: // TODO reconsider with operation types


src/main/java/org/apache/sysds/runtime/data/BasicTensorBlock.java (10 lines):
	- line 149: //TODO simplify estimated non-zeros
	- line 204: // TODO: use _denseBlock.reset instead, since LDRB need to check dimensions for actually available space
	- line 302: // TODO: Implement sparse
	- line 329: // TODO: Implement sparse
	- line 464: // TODO implement sparse set instead of converting to dense
	- line 484: else // TODO copy sparse to dense, dense to dense or sparse to dense
	- line 522: // TODO consider sparse
	- line 545: // TODO Auto-generated method stub
	- line 559: // TODO allow to aggregate along a dimension?
	- line 560: // TODO performance


src/main/java/org/apache/sysds/runtime/instructions/spark/AggregateUnarySPInstruction.java (10 lines):
	- line 117: //TODO: Make memory for the future matrix block
	- line 174: // TODO support DataTensor
	- line 178: // TODO: filter input blocks for trace
	- line 186: // TODO filter non empty blocks if sparse safe
	- line 192: // TODO generalize to drop depending on location of correction
	- line 193: // TODO support DataTensor
	- line 206: // TODO MULTI_BLOCK
	- line 306: // TODO support DataTensor
	- line 355: // TODO support DataTensor
	- line 362: // TODO generalize to drop depending on location of correction


src/main/java/org/apache/sysds/runtime/controlprogram/parfor/opt/OptimizerRuleBased.java (10 lines):
	- line 130: * TODO fuse also result merge into fused data partitioning and execute
	- line 136: * TODO take remote memory into account in data/result partitioning rewrites (smaller/larger)
	- line 137: * TODO memory estimates with shared reads
	- line 138: * TODO memory estimates of result merge into plan tree
	- line 139: * TODO blockwise partitioning
	- line 466: * TODO consolidate mem estimation with Indexing Hop
	- line 844: //TODO get a proper time estimate based to capture compute-intensive scenarios
	- line 1162: //FIXME rework for nested parfor parallelism and body w/o gpu ops
	- line 1408: * TODO modify 'set exec strategy' and related rewrites for conditional data partitioning.
	- line 2125: //TODO rework memory handling for spark


src/main/java/org/apache/sysds/runtime/transform/encode/MultiColumnEncoder.java (8 lines):
	- line 362: // FIXME: estimate nnz for multiple encoders including dummycode
	- line 387: // TODO smart checks
	- line 409: // TODO set NNZ explicit count them in the encoders
	- line 550: // TODO: If still don't fit, serialize the column encoders
	- line 587: // TODO: Reduce only the ones with large maps
	- line 618: // TODO: Reduce the large encoder types, similar to getNumBuildBlksMemorySafe
	- line 1072: // TODO cache results for faster access
	- line 1563: // TODO: experiment if it makes sense to parallize here (for frames with many rows)


src/main/java/org/apache/sysds/runtime/controlprogram/ParForProgramBlock.java (7 lines):
	- line 114: * TODO: reduction variables (operations: +=, -=, /=, *=, min, max)
	- line 115: * TODO: papply(A,1:2,FUN) language construct (compiled to ParFOR) via DML function repository =&gt; modules OK, but second-order functions required
	- line 687: //TODO reset of hop parallelism constraint (e.g., ba+*)
	- line 874: // TODO: remove duplicate lineage items in ec.getLineage()
	- line 966: || OptimizerUtils.isSparkExecutionMode() ) //TODO support for binarycell
	- line 1130: //TODO needs as precondition a systematic treatment of persistent read information.
	- line 1445: * TODO The optimizer should explicitly decide about parallel result merge and its degree of parallelism.


src/main/java/org/apache/sysds/runtime/instructions/cp/VariableCPInstruction.java (7 lines):
	- line 350: // TODO - replace hardcoded numbers with more sophisticated code
	- line 375: //TODO choose correct value type for tensor
	- line 433: // TODO correct sizes
	- line 896: //TODO handling of cleanup status, potentially new object
	- line 933: //TODO handling of cleanup status, potentially new object
	- line 1083: // TODO write tensor
	- line 1210: //FIXME why is this writer never used?


src/main/java/org/apache/sysds/parser/BuiltinFunctionExpression.java (7 lines):
	- line 220: //TODO: LSTM on GPU has different INPUT/OUTPUT than LSTM on CPU
	- line 1125: //output.setDataType(id.getDataType()); //TODO whenever we support multiple matrix value types, currently noop.
	- line 1134: //output.setDataType(id.getDataType()); //TODO whenever we support multiple matrix value types, currently noop.
	- line 1143: //output.setDataType(id.getDataType()); //TODO whenever we support multiple matrix value types, currently noop.
	- line 1230: // TODO: remove this when ppred has been removed from DML
	- line 1610: //TODO set output type to boolean when supported
	- line 2287: // TODO get supported Operations form builtins


src/main/java/org/apache/sysds/runtime/instructions/spark/RandSPInstruction.java (7 lines):
	- line 536: //step 2: TODO potential in-memory rand operations if applicable
	- line 541: // TODO calculate totalSize
	- line 542: // TODO use real blocksize given by instruction (once correct)
	- line 607: // TODO getDimLengthPerBlock accurate for each dimension
	- line 988: //TODO fix hard-coded seed
	- line 1104: // TODO: accurate block size computation
	- line 1114: // TODO implement sparse support


src/main/python/systemds/scuro/modality/joined.py (7 lines):
	- line 60: chunked_execution  # TODO: maybe move this into parent class
	- line 85: ):  # TODO compute correct alignment timestamps/spatial params
	- line 100: # TODO: need to extract the shape of the data from the metadata
	- line 140: ]  # TODO: check correct loading for all data layouts, this is similar to missing data, add a different operation for this
	- line 170: ):  # TODO: use the filed name to extract data entries from modalities
	- line 206: ):  # TODO: only if the layout is list_of_lists_of_numpy_array
	- line 222: else:  # TODO: refactor this approach (it is changing the way the modalities are joined)


src/main/java/org/apache/sysds/runtime/lineage/LineageRecomputeUtils.java (6 lines):
	- line 98: // Disable GPU execution. TODO: Support GPU
	- line 135: //FIXME: any lineage-based restore in the bufferpool flushes the lineage cache
	- line 409: //TODO handling of tsmm type left and right -> placement transpose
	- line 496: //FIXME: the keys of operands can be replaced inside rConstructHops
	- line 513: // TODO: multi-return function
	- line 802: //TODO handling of tsmm type left and right -> placement transpose


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederationMap.java (6 lines):
	- line 277: //TODO support operations with fully broadcast objects
	- line 520: // TODO handling of file path, but no danger as never written
	- line 538: // TODO handling of file path, but no danger as never written
	- line 728: // TODO perf
	- line 729: // TODO: add a check if the map is sorted based on indexes before reversing.
	- line 730: // TODO: add a setup such that on construction the federated map is already sorted.


src/main/java/org/apache/sysds/parser/DataExpression.java (6 lines):
	- line 446: // TODO use byRow parameter
	- line 646: //        TODO convert double Matrix to String Frame
	- line 673: // TODO convert double Matrix to long Matrix
	- line 1657: // TODO set correct dimensions
	- line 2062: // TODO get size
	- line 2140: // TODO value type for federated object


src/main/java/org/apache/sysds/runtime/controlprogram/paramserv/FederatedPSControlThread.java (5 lines):
	- line 105: _weighting = weighting && (!use_homomorphic_encryption); // FIXME: this disables weighting in favor of homomorphic encryption
	- line 319: // TODO: set other CKKS parameters
	- line 320: // TODO generate partial public key
	- line 668: // FIXME ensure that with modelAvg we always update the model
	- line 688: // TODO double check cleanup gradients and models


src/main/java/org/apache/sysds/hops/AggBinaryOp.java (5 lines):
	- line 141: //return false; // TODO: Disabling any fused transa optimization in 1.0 release.
	- line 1136: //TODO relax requirement of valid CP dimensions once we support broadcast creation from files/RDDs
	- line 1184: //TODO currently we reuse the mr estimates, these need to be fine-tune for our spark operators
	- line 1200: // TODO: we must factor in the "sparsity"
	- line 1227: // TODO: we must factor in the "sparsity"


src/main/java/org/apache/sysds/runtime/instructions/fed/InitFEDInstruction.java (5 lines):
	- line 136: // TODO relax requirement by using different execution contexts per federated data?
	- line 325: // TODO: Construct new protocol name for Federated communication
	- line 331: // TODO: Support IPV6 address for Federated communication
	- line 356: // TODO: Construct new protocol name for Federated communication
	- line 362: // TODO: Support IPV6 address for Federated communication


src/main/java/org/apache/sysds/runtime/lineage/LineageSparkCacheEviction.java (5 lines):
	- line 45: //TODO: Cleanup the RDDs and BC variables
	- line 69: // FIXME: avoid when called from partial reuse methods
	- line 128: // TODO: Reduce to avoid disk spilling. 80% of storage.
	- line 150: // FIXME: Actual memory usage is often way more than the estimated,
	- line 188: // TODO: Cleanup the child RDDs of the persisted RDDs


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixAgg.java (5 lines):
	- line 94: * TODO next opcode extensions: a+, colindexmax
	- line 703: * TODO: this should not be part of block operations but of the MR instruction.
	- line 3659: //TODO: currently impossible case, since Dedup reshape is not supported yet, once it is, this method needs
	- line 3679: //TODO: currently impossible case, since Dedup reshape is not supported yet, once it is, this method needs
	- line 3699: //TODO: currently impossible case, since Dedup reshape is not supported yet, once it is, this method needs


src/main/java/org/apache/sysds/runtime/iogen/FormatIdentifyer.java (5 lines):
	- line 290: // TODO: extend sequential scattered format algorithm for heterogeneous structures
	- line 310: // TODO: decrease the number of row/col indexes want to check(3 or 5)
	- line 1063: // TODO Removed an unlikely argument it should not be a problem.
	- line 1114: // TODO find out if used:
	- line 1353: // TODO: we have to apply tokenizer


src/main/java/org/apache/sysds/lops/compile/linearization/LinearizerCostBased.java (5 lines):
	- line 44: // TODO: Partition the DAG if connected by a single node. Optimize separately
	- line 54: // TODO: Handle distributed and GPU operators (0 compute cost, memory overhead on collect)
	- line 55: // TODO: Asynchronous operators (max of compute costs, total operation memory overhead)
	- line 57: // TODO: Select the order with minimum compute cost and buffer pool evictions
	- line 207: // TODO: Add IO time to compute cost for evictions


src/main/java/org/apache/sysds/hops/OptimizerUtils.java (5 lines):
	- line 225: //TODO enabling it by default requires modifications in lineage-based reuse
	- line 485: //TODO this is a workaround for MLContext to avoid a major refactoring before the release; this method
	- line 650: // TODO estimate exact size
	- line 852: // TODO estimate partitioned size exact for tensor
	- line 977: // TODO accurate estimation


src/main/java/org/apache/sysds/runtime/instructions/spark/MatrixReshapeSPInstruction.java (4 lines):
	- line 73: //TODO handle dims for tensors parts[4]
	- line 120: // TODO Tensor reshape
	- line 125: // TODO merge by key
	- line 203: //            // TODO create iterator


src/main/java/org/apache/sysds/parser/dml/DmlSyntacticValidator.java (4 lines):
	- line 525: // TODO: remove this when castAsScalar has been removed from DML/PYDML
	- line 1073: // TODO Auto-generated method stub
	- line 1460: // TODO: extract more meaningful info from this exception.
	- line 1561: // TODO: extract more meaningful info from this exception.


src/main/java/org/apache/sysds/common/Builtins.java (4 lines):
	- line 260: OUTLIER("outlier", true, false), //TODO parameterize opposite
	- line 315: SLICEFINDER("slicefinder", true), //TODO remove
	- line 351: WINSORIZE("winsorize", true, false), //TODO parameterize w/ prob, min/max val
	- line 352: WINSORIZEAPPLY("winsorizeApply", true, false), //TODO parameterize w/ prob, min/max val


src/main/java/org/apache/sysds/hops/fedplanner/FederatedPlanCostEnumerator.java (4 lines):
	- line 73: // TODO: Just for debug, remove later
	- line 183: // TODO: Do not descend for visited functions (use a hash set for functions using their names)
	- line 245: // TODO: Should we check all statement-level root hops to see if they are not referenced?
	- line 248: // TODO: Just for debug, remove later


src/main/java/org/apache/sysds/runtime/controlprogram/caching/TensorObject.java (4 lines):
	- line 149: // TODO correct blocksize;
	- line 150: // TODO read from RDD
	- line 179: //TODO check correct blocking
	- line 199: //TODO rdd write


src/main/java/org/apache/sysds/runtime/lineage/LineageItemUtils.java (4 lines):
	- line 202: //TODO: trace all UDFs
	- line 317: //TODO: include all the other hops
	- line 372: //TODO should use the same placeholder meta data as codegen
	- line 547: //TODO: add 'read' in this list


src/main/java/org/apache/sysds/hops/Hop.java (4 lines):
	- line 389: //FIXME: Compute cost. Handle multiple Lops from one Hop case
	- line 486: //TODO generalize threads
	- line 725: * TODO remove memo table and, on constructor refresh, inference in refresh, single compute mem,
	- line 1191: //TODO: set the flag in the HOP via a rewrite


src/main/java/org/apache/sysds/lops/rewrite/RewriteAddPrefetchLop.java (4 lines):
	- line 77: //FIXME: Rewire _inputParams when needed (e.g. GroupedAggregate)
	- line 116: // FIXME: Rewire _inputParams when needed (e.g. GroupedAggregate)
	- line 121: // TODO: support non-matrix outputs
	- line 136: // FIXME: Rewire _inputParams when needed (e.g. Replace)


scripts/staging/onnx/onnx_systemds/onnx_helper.py (4 lines):
	- line 158: # TODO: these type translations are not correct double -> float
	- line 184: # TODO: add support for other data types
	- line 202: # TODO: shapes with no value but instead name -> support?
	- line 208: # TODO: not sure this is the solution for every instance of this problem


src/main/java/org/apache/sysds/runtime/lineage/LineageCacheEviction.java (4 lines):
	- line 90: // FIXME: avoid when called from partial reuse methods
	- line 245: //TODO: Graceful handling of status.
	- line 335: // TODO: exponential smoothing with arbitrary smoothing factor
	- line 427: // TODO: set cache status as RELOADED for this entry


src/main/java/org/apache/sysds/hops/DataGenOp.java (4 lines):
	- line 122: //TODO size information for tensor
	- line 252: // TODO size information for tensors
	- line 341: // TODO size information for tensor
	- line 361: //TODO fix parser exception handling and enable check by default


src/main/java/org/apache/sysds/runtime/lineage/LineageItem.java (4 lines):
	- line 43: private final BooleanArray32 _specialValueBits;  // TODO: Move this to a new subclass
	- line 46: //TODO replace with thread local concurrent hashmap per worker
	- line 343: // FIXME: Two dedup nodes can have matching patches but different #inputs
	- line 377: continue; //FIXME: fill phMap


src/main/python/systemds/context/systemds_context.py (4 lines):
	- line 254: # TODO: refine the choise of configuration file
	- line 461: :param shape: shape (rows and cols) of the matrix TODO tensor
	- line 645: # TODO Support tensors.
	- line 673: # TODO Support tensors.


src/main/java/org/apache/sysds/runtime/data/SparseBlockDCSR.java (4 lines):
	- line 53: //TODO: This allocates too much space (we care about number of non-empty rows)
	- line 389: // TODO: performance
	- line 435: // TODO performance
	- line 607: // TODO: performance


src/main/java/org/apache/sysds/runtime/io/ReaderCOG.java (3 lines):
	- line 76: // TODO: Currently only reads the first image which is the full resolution image
	- line 79: // TODO: Is the metadata (e.g. the coordinates) necessary in SystemDS? Currently not possible as we only return a MatrixBlock
	- line 164: // TODO: Currently this doesn't seem standardized properly, there are still open GitHub issues about that


src/main/java/org/apache/sysds/runtime/lineage/LineageCacheEntry.java (3 lines):
	- line 358: // TODO: Multiple eviction policies.
	- line 366: // TODO: timestamp >> DAg_height. Normalize timestamp and DAG height.
	- line 453: // TODO: Support sparse pointer caching


scripts/staging/onnx/onnx_systemds/operator_gen.py (3 lines):
	- line 259: batch_size = x_shape[0]  # TODO: currently not used
	- line 357: batch_size = x_shape[0]  # TODO: Batch size unused?
	- line 365: C_group = W_shape[1]  # TODO Channels/group unused?


src/main/java/org/apache/sysds/runtime/instructions/spark/BinarySPInstruction.java (3 lines):
	- line 210: // TODO blocking scheme for matrices with mismatching number of dimensions
	- line 295: // TODO less dims broadcast variable
	- line 417: // TODO print dimensions


src/main/java/org/apache/sysds/hops/rewrite/RewriteElementwiseMultChainOptimization.java (3 lines):
	- line 255: //TODO replace by ComparableHop wrapper around hop that implements equals and compareTo
	- line 335: // TODO proper handling of DAGs (avoid collecting the same leaf multiple times)
	- line 336: // TODO exclude hops with unknown dimensions and move rewrites to dynamic rewrites


src/main/java/org/apache/sysds/runtime/transform/encode/ColumnEncoderComposite.java (3 lines):
	- line 46: // TODO assert each type of encoder can only be present once
	- line 173: // TODO: is that still needed? currently there is no CompositeEncoder with 2 encoders with build phase
	- line 266: // TODO maybe assert that the _encoders never have the same type of encoder twice or more


src/main/java/org/apache/sysds/runtime/instructions/fed/MultiReturnParameterizedBuiltinFEDInstruction.java (3 lines):
	- line 356: //encoder.build(fb, OptimizerUtils.getTransformNumThreads()); // FIXME skip equi-height sorting
	- line 357: // FIXME: Enabling multithreading intermittently hangs
	- line 392: // FIXME: Enabling multithreading intermittently hangs


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederatedWorkerHandler.java (3 lines):
	- line 394: if(shouldTryAsyncCompress()) // TODO: replace the reused object
	- line 593: //TODO handling of spark instructions should be under control of federated site not coordinator
	- line 619: // TODO move this thread naming to Netty thread creation!


src/main/java/org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.java (3 lines):
	- line 152: // FIXME: Parfor splits this 70% into smaller limits
	- line 163: // TODO: Track preserved output memory to protect from concurrent threads
	- line 410: //TODO implement


src/main/java/org/apache/sysds/lops/rewrite/RewriteAddChkpointInLoop.java (3 lines):
	- line 50: // TODO: support If-Else block inside loop. Consumers inside branches.
	- line 85: // TODO: A rewrite pass to remove less effective checkpoints
	- line 97: // TODO: Check if this lop leads to one of those variables


src/main/java/org/apache/sysds/hops/TernaryOp.java (3 lines):
	- line 551: //TODO double check reset (dimsInputPresent?)
	- line 579: // TODO qx1
	- line 654: // TODO: to rewrite is not currently not triggered if outdim are given --> getInput().size()>=3


src/main/java/org/apache/sysds/runtime/instructions/fed/CumulativeOffsetFEDInstruction.java (3 lines):
	- line 174: //TODO perf simple rbind, as the first row (init) is anyway not transferred
	- line 262: //TODO perf no need to execute here, we can piggyback the requests onto the final cumagg
	- line 272: //TODO perf improvement (currently this creates a sliced broadcast in the size of the original matrix


src/main/java/org/apache/sysds/hops/rewrite/MarkForLineageReuse.java (3 lines):
	- line 84: //TODO: nested loops.
	- line 150: //TODO: extend all the hops to propagate till variablecp output
	- line 152: // TODO: logic to separate out partially reusable cases (e.g cbind-tsmm)


src/main/java/org/apache/sysds/parser/StatementBlock.java (3 lines):
	- line 497: //TODO handle predicates
	- line 528: //TODO handle predicates
	- line 1422: // FIXME: Type is not the best key as many Lops may have the same types


src/main/java/org/apache/sysds/runtime/instructions/gpu/context/GPUMemoryManager.java (3 lines):
	- line 284: // TODO: Copy conditionally (if score > theta)
	- line 292: // TODO: Handle live (dirty) objects separately. Copy them back to the host
	- line 348: // FIXME: performance improvement. Slow due to looping and holes.


src/main/java/org/apache/sysds/runtime/frame/data/columns/BitSetArray.java (3 lines):
	- line 258: // TODO add an vectorized setNz.
	- line 403: // TODO: fix inefficient transfer 8 x bigger.
	- line 568: // TODO vectorize


src/main/java/org/apache/sysds/hops/rewrite/RewriteAlgebraicSimplificationDynamic.java (3 lines):
	- line 199: hi = reorderMinusMatrixMult(hop, hi, i);          //e.g., (-t(X))%*%y->-(t(X)%*%y), TODO size
	- line 830: // TODO implement for tensor
	- line 951: else //diagm2v TODO support tensor operation


src/main/java/org/apache/sysds/runtime/controlprogram/parfor/opt/OptTreeConverter.java (3 lines):
	- line 261: //TODO task size
	- line 274: //TODO remove this workaround once this information can be obtained from hops/lops compiler
	- line 324: // TODO: create execution mode for parfor loop


src/main/java/org/apache/sysds/lops/rewrite/RewriteAddBroadcastLop.java (3 lines):
	- line 53: //FIXME: Wire Broadcast only with the necessary outputs
	- line 59: //FIXME: Rewire _inputParams when needed (e.g. GroupedAggregate)
	- line 79: //TODO: Early broadcast objects that are bigger than a single block


src/main/java/org/apache/sysds/runtime/instructions/gpu/context/GPUMemoryEviction.java (3 lines):
	- line 78: // TODO: First remove the gobj chains that don't contain any live and dirty objects.
	- line 106: //FIXME: adding to rmVar cache causes multiple failures due to concurrent
	- line 141: if (DMLScript.STATISTICS) //TODO: dedicated statistics for lineage


src/main/java/org/apache/sysds/runtime/instructions/spark/DnnSPInstruction.java (3 lines):
	- line 220: // TODO: Inject checkpoint to avoid doing this repeated for validation set
	- line 244: // TODO: Handle large filters > 2G
	- line 280: long nnz = -1; // TODO: Handle nnz


src/main/java/org/apache/sysds/runtime/instructions/gpu/context/GPUObject.java (3 lines):
	- line 336: // TODO: What if mat.getNnz() is -1 ?
	- line 665: // TODO: Future optimization:
	- line 851: // TODO - should we do this on the GPU using cusparse<t>coo2csr() ?


src/main/java/org/apache/sysds/hops/DnnOp.java (3 lines):
	- line 255: //TODO move these custom rewrites to the general hop rewrites
	- line 335: // TODO double check that optionalMaxPoolOutput adheres to proper
	- line 578: // TODO: Fix this after adding remaining spark instructions


src/main/java/org/apache/sysds/runtime/instructions/fed/UnaryMatrixFEDInstruction.java (3 lines):
	- line 166: //TODO perf simple rbind, as the first row (init) is anyway not transferred
	- line 254: //TODO perf no need to execute here, we can piggyback the requests onto the final cumagg
	- line 264: //TODO perf improvement (currently this creates a sliced broadcast in the size of the original matrix


src/main/java/org/apache/sysds/api/DMLScript.java (3 lines):
	- line 244: //TODO fix null default options
	- line 251: //TODO fix null default options
	- line 624: // TODO fix and replace localhost identifyer with hostname in federated instructions SYSTEMDS-3440


src/main/java/org/apache/sysds/hops/recompile/Recompiler.java (3 lines):
	- line 1360: // TODO: correct dimensions
	- line 1389: // TODO refresh tensor size information
	- line 1442: //TODO tensor rewrite


src/main/java/org/apache/sysds/runtime/instructions/cp/ReshapeCPInstruction.java (3 lines):
	- line 75: // TODO support DataTensor
	- line 84: // TODO metadata operation
	- line 89: // TODO support frame and list. Before we implement list it might be good to implement heterogeneous tensors


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixReorg.java (3 lines):
	- line 567: //TODO perf: reconsider partition sort to avoid unnecessary barriers
	- line 1165: //TODO more robust (memory efficient) implementation w/o tmp block
	- line 2372: // TODO use optimized mod inverse operation.


src/main/java/org/apache/sysds/runtime/util/DataConverter.java (2 lines):
	- line 1007: // TODO use sparse iterator for sparse block
	- line 1272: // TODO warning if double value is cast to long?


src/main/java/org/apache/sysds/hops/cost/CostEstimatorStaticRuntime.java (2 lines):
	- line 398: //TODO add cost functions for commons math builtins: inverse, cholesky
	- line 486: xf = 32;    // TODO - assuming worst case for now


src/main/java/org/apache/sysds/hops/fedplanner/FederatedPlanCostEstimator.java (2 lines):
	- line 61: // TODO: Q. Shouldn't the child's forwarding cost follow the parent's weight, regardless of loops or if-else statements?
	- line 91: // Therefore, the weight for forwarding follows the parent's weight (TODO: Q. Is the parent also receiving forwarding once?)


src/main/java/org/apache/sysds/lops/rewrite/RewriteAddGPUEvictLop.java (2 lines):
	- line 47: // TODO: Move this as a Statement block rewrite
	- line 72: // TODO: Add another input for the backend (GPU/CPU/Spark)


src/main/java/org/apache/sysds/runtime/transform/decode/DecoderDummycode.java (2 lines):
	- line 54: //TODO perf (exploit sparse representation for better asymptotic behavior)
	- line 62: //TODO perf (exploit sparse representation for better asymptotic behavior)


src/main/java/org/apache/sysds/runtime/lineage/LineageCacheConfig.java (2 lines):
	- line 63: //TODO: Reuse everything.
	- line 427: // TODO: Automatic tuning of weights.


src/main/java/org/apache/sysds/utils/NativeHelper.java (2 lines):
	- line 358: // TODO: Add pmm, wsloss, mmchain, etc.
	- line 373: // TODO: case not handled: sparse filters (which will only be executed in Java). Since filters are relatively smaller,


src/main/java/org/apache/sysds/hops/codegen/opt/PlanSelectionFuseCostBased.java (2 lines):
	- line 367: //TODO branch and bound pruning, right now we use exhaustive enum for early experiments
	- line 661: case SINH:    costs = 93; break; // TODO:


src/main/java/org/apache/sysds/runtime/instructions/spark/utils/RDDAggregateUtils.java (2 lines):
	- line 679: // TODO remove once KahanPlus is completely replaced by plus
	- line 685: // TODO support DataTensor


src/main/java/org/apache/sysds/runtime/instructions/spark/MultiReturnParameterizedBuiltinSPInstruction.java (2 lines):
	- line 273: // TODO check in debbuger if correct
	- line 358: else //TODO: support equi-height


src/main/java/org/apache/sysds/lops/rewrite/RewriteUpdateGPUPlacements.java (2 lines):
	- line 50: // TODO: Iterate multiple times to propagate the updates
	- line 88: // TODO: Propagate GPU execution types to DataOps (in hop level or lop level).


src/main/java/org/apache/sysds/runtime/io/ReaderCOGParallel.java (2 lines):
	- line 87: // TODO: Currently only reads the first image which is the full resolution image
	- line 192: // TODO: If the tile is compressed, decompress the currentTileData here


src/main/java/org/apache/sysds/runtime/controlprogram/paramserv/homomorphicEncryption/SEALServer.java (2 lines):
	- line 39: // TODO take params here, like slot_count etc.
	- line 104: // TODO: extract an interface for this and use it here


src/main/java/org/apache/sysds/hops/UnaryOp.java (2 lines):
	- line 162: // TODO additional physical operation if offsets fit in memory
	- line 578: // TODO handle overlapping state, since some operations would not lead to compressed output.


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederatedStatistics.java (2 lines):
	- line 229: //TODO merge with existing
	- line 686: // TODO fix this class to use shallow pointers.


src/main/java/org/apache/sysds/runtime/lineage/LineageDedupUtils.java (2 lines):
	- line 109: // TODO: find the inputs from the ProgramBlock instead of StatementBlock
	- line 204: // FIXME: This logic removes only the live variables from lineage cache.


src/main/cpp/he/he.cpp (2 lines):
	- line 33: // FIXME: this copies string data once. maybe implement a custom stream
	- line 42: string data = stream.str(); // FIXME: this copies string content. maybe implement custom ostream


src/main/java/org/apache/sysds/runtime/lineage/LineageCacheStatistics.java (2 lines):
	- line 190: // TODO: Handle overflow
	- line 196: // TODO: Handle overflow


src/main/java/org/apache/sysds/parser/dml/CustomErrorListener.java (2 lines):
	- line 73: //TODO MB: we should not redundantly log errors here
	- line 295: //TODO MB: This classification is misleading as it only refers to variations of parsing issues.


src/main/java/org/apache/sysds/runtime/transform/encode/ColumnEncoderUDF.java (2 lines):
	- line 46: //TODO pass execution context through encoder factory for arbitrary functions not just builtin
	- line 47: //TODO integration into IPA to ensure existence of unoptimized functions


src/main/java/org/apache/sysds/hops/fedplanner/FederatedPlannerFedAll.java (2 lines):
	- line 81: //TODO currently this rewrite assumes consistent decisions in conditional control flow
	- line 122: //TODO handle function calls


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederationUtils.java (2 lines):
	- line 110: //TODO remove rmFedOutFlag, once all federated instructions have this flag, then unconditionally remove
	- line 239: // TODO handle non-contiguous cases


src/main/java/org/apache/sysds/runtime/instructions/fed/BinaryFEDInstruction.java (2 lines):
	- line 142: // TODO remove
	- line 160: // TODO different binary instructions


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixBincell.java (2 lines):
	- line 215: // TODO fix all variants to be feasible for multi-threading
	- line 1238: // TODO change this to a fill operation.


src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupLinearFunctional.java (2 lines):
	- line 378: // TODO: add specialization for sparse/dense matrix blocks
	- line 467: // TODO: implement


src/main/java/org/apache/sysds/hops/rewrite/RewriteAlgebraicSimplificationStatic.java (2 lines):
	- line 226: //TODO move to dynamic rewrites (since size dependent to account for mv binary cell and outer operations)
	- line 2306: //TODO add remaining cases of comparison operators


src/main/java/org/apache/sysds/runtime/controlprogram/paramserv/SparkParamservUtils.java (2 lines):
	- line 52: //TODO Add an additional physical operator which broadcasts the labels directly (broadcast join with features) if certain memory budgets are satisfied
	- line 57: //TODO could use join and aggregation to avoid unnecessary shuffle introduced by reduceByKey


src/main/java/org/apache/sysds/runtime/compress/lib/CLALibScalar.java (2 lines):
	- line 222: else // TODO : cleanup to also colapse groups in this case.
	- line 247: else // TODO : cleanup to also colapse groups in this case.


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixMult.java (2 lines):
	- line 221: //TODO: currently impossible case, since Dedup reshape is not supported yet, once it is, this method needs
	- line 1184: //TODO: currently impossible case, since Dedup reshape is not supported yet, once it is, this method needs


src/main/java/org/apache/sysds/runtime/instructions/cp/DataGenCPInstruction.java (2 lines):
	- line 335: // TODO handle runtime seed
	- line 353: // TODO fix hard-coded seed, consistently with sparse frame init


src/main/java/org/apache/sysds/runtime/instructions/spark/ParameterizedBuiltinSPInstruction.java (2 lines):
	- line 647: //FIXME: Taking only spec file name as a literal leads to wrong reuse
	- line 648: //TODO: Add Embedding to the lineage item


src/main/java/org/apache/sysds/runtime/frame/data/FrameBlock.java (2 lines):
	- line 423: // TODO: Add append N function.
	- line 1306: // TODO remove sync locks on array types where they are not needed.


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixCuDNN.java (2 lines):
	- line 74: // TODO: experiment how often does dense matrix is empty where recomputing nnz before calling CuDNN will help
	- line 789: Pointer srcData = getDensePointerForCuDNN(gCtx, in, instName); // TODO: FIXME: Add sparse kernel support for relu


src/main/java/org/apache/sysds/lops/Sql.java (2 lines):
	- line 60: // TODO spark
	- line 87: // TODO Sql.toString() lop


src/main/java/org/apache/sysds/runtime/instructions/fed/ReshapeFEDInstruction.java (2 lines):
	- line 67: // TODO: add dims argument (for tensors) to MatrixReshapeSPInstruction
	- line 150: // TODO support tensor out, frame and list


src/main/java/org/apache/sysds/runtime/instructions/fed/IndexingFEDInstruction.java (2 lines):
	- line 296: // TODO shallow copy, add more advanced update in place for federated
	- line 321: //TODO remove explicit put (unnecessary in CP, only spark which is about to be cleaned up)


src/main/java/org/apache/sysds/lops/rewrite/RewriteAddChkpointLop.java (2 lines):
	- line 61: // TODO: A rewrite pass to remove less effective checkpoints
	- line 101: // TODO: Call recompiler on the loops


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixCountDistinct.java (2 lines):
	- line 60: * TODO: If the MatrixBlock type is CompressedMatrix, simply read the values from the ColGroups.
	- line 198: // TODO Explore row-wise and column-wise methods for SparseBlockIterator


src/main/java/org/apache/sysds/lops/rewrite/LopRewriter.java (2 lines):
	- line 49: // TODO: A rewrite pass to remove less effective chkpoints
	- line 118: //TODO: parfor statement blocks


src/main/java/org/apache/sysds/runtime/data/LibTensorBincell.java (2 lines):
	- line 45: // TODO separate implementations for matching dims and broadcasting
	- line 46: // TODO perf (empty, sparse safe, etc.)


src/main/java/org/apache/sysds/runtime/instructions/fed/SpoofFEDInstruction.java (2 lines):
	- line 241: //TODO fix check by num rows/cols
	- line 518: // TODO: use the `SpoofOperator` instead of the `Class<?>`, as it is more robust to inheritance hierarchy change


src/main/java/org/apache/sysds/runtime/instructions/InstructionUtils.java (2 lines):
	- line 720: // TODO add Multithreaded threads to Scalar operations.
	- line 1092: //TODO use appropriate function objects for min/max (see sum)


src/main/java/org/apache/sysds/runtime/controlprogram/parfor/RemoteDPParForSpark.java (2 lines):
	- line 60: * TODO heavy hitter maintenance
	- line 61: * TODO data partitioning with binarycell


src/main/java/org/apache/sysds/runtime/transform/tokenize/Tokenizer.java (2 lines):
	- line 126: // TODO further optimisation of task graph to reduce memory usage!
	- line 127: // TODO add cache awareness


src/main/java/org/apache/sysds/runtime/data/LibTensorReorg.java (2 lines):
	- line 63: else // TODO deep copy
	- line 68: // TODO eval sparse output


src/main/java/org/apache/sysds/runtime/lineage/LineageGPUCacheEviction.java (2 lines):
	- line 109: // TODO: Scale score after every cache hit if not LRU
	- line 227: // TODO: move to the shadow buffer. Convert to double precision only when reused.


src/main/java/org/apache/sysds/hops/codegen/SpoofCompiler.java (2 lines):
	- line 226: // TODO: Code is unreachable here
	- line 288: //FIXME completely remove or load via resource stream (see builtin functions)


src/main/java/org/apache/sysds/runtime/data/DenseBlockFP64.java (2 lines):
	- line 169: //TODO generalize to non-double dense blocks
	- line 170: //TODO should we specify that the length HAS TO BE (ru - rl) * (ou - ol) == db.size()? or allow partial sets


src/main/java/org/apache/sysds/runtime/instructions/cp/FunctionCallCPInstruction.java (2 lines):
	- line 253: //FIXME: interferes with reuse. Removes broadcasts before materialization
	- line 281: //FIXME: send _boundOutputNames instead of fpb.getOutputParams as


src/main/python/systemds/scuro/representations/window.py (2 lines):
	- line 25: # TODO: move this into the aggregation class and add an aggregate() and a window(window_size) function there so they can use the same functionality.
	- line 45: )  # TODO: add actual aggregation function here


src/main/python/systemds/operator/algorithm/builtin/garch.py (2 lines):
	- line 46: TODO: use BFGS or BHHH if it is available (this are go to methods)
	- line 47: TODO: (only then) extend to garch(p,q); otherwise the search space is way too big for the current method


src/main/java/org/apache/sysds/runtime/instructions/cp/ParamservBuiltinCPInstruction.java (2 lines):
	- line 121: // FIXME: does not work if features are federated, but labels are not
	- line 233: // TODO: accumulate public keys with SEAL


src/main/java/org/apache/sysds/runtime/instructions/fed/VariableFEDInstruction.java (2 lines):
	- line 48: // TODO: merge with `CastFEDInstruction`
	- line 99: // TODO Add write command to the federated site if the matrix has been modified


src/main/java/org/apache/sysds/runtime/transform/encode/ColumnEncoderBin.java (2 lines):
	- line 317: // FIXME current NaN handling introduces 0s and thus
	- line 663: // TODO: Derive bin boundaries from partial aggregates, avoiding


src/main/cuda/kernels/SystemDS.cu (2 lines):
	- line 265: * TODO: Alternative approach: use dynamic parallelism. We are skipping this
	- line 411: // TODO: Potential to reduce the number of threads by half


src/main/java/org/apache/sysds/runtime/io/FrameWriterParquet.java (2 lines):
	- line 90: // TODO:Experiment with different batch sizes?
	- line 94: // Write data using ParquetWriter //FIXME replace example writer?


src/main/java/org/apache/sysds/runtime/data/DenseBlockInt32.java (2 lines):
	- line 156: //TODO investigate potential deadlocks if already in parallel setting w/ commonPool
	- line 163: //TODO avoid array allocation


src/main/java/org/apache/sysds/runtime/instructions/spark/ComputationSPInstruction.java (2 lines):
	- line 97: // TODO the dcOut dims will not be accurate here, because set output dimensions currently do only support
	- line 105: // TODO remove this once dcOut dims are accurate if known


src/main/java/org/apache/sysds/hops/BinaryOp.java (2 lines):
	- line 984: // TODO size information for tensor
	- line 1041: //TODO quantile


src/main/java/org/apache/sysds/hops/FunctionOp.java (2 lines):
	- line 227: // TODO: To allow for initial version to always run on the GPU
	- line 307: // TODO: To allow for initial version to always run on the GPU


src/main/java/org/apache/sysds/runtime/lineage/LineageEstimator.java (2 lines):
	- line 72: // TODO: handling of parfor, statementblock reuse
	- line 73: // TODO: collect lineage tracing and probing overhead (computation)


src/main/java/org/apache/sysds/runtime/instructions/gpu/DnnGPUInstruction.java (2 lines):
	- line 619: // TODO: find out if memset is necessary
	- line 825: // TODO: For now always copy the device data to host


src/main/java/org/apache/sysds/hops/rewrite/RewriteCompressedReblock.java (2 lines):
	- line 187: // TODO decompression Condition
	- line 357: // TODO handle of functions in a more fine-grained manner


src/main/java/org/apache/sysds/runtime/data/SparseBlockCSR.java (2 lines):
	- line 43: * TODO: extensions for faster incremental construction (e.g., max row)
	- line 44: * TODO more efficient fused setIndexRange impl to avoid repeated copies and updates


src/main/java/org/apache/sysds/common/Types.java (2 lines):
	- line 79: //TODO remove from Data Type -> generic object
	- line 558: //low-level operators //TODO used?


src/main/java/org/apache/sysds/hops/ParameterizedBuiltinOp.java (2 lines):
	- line 303: //TODO this special case could be taken into account for memory estimates in order
	- line 1084: private boolean isRemoveEmptyBcSP() // TODO find if 2 x size needed.


src/main/java/org/apache/sysds/runtime/instructions/cp/SqlCPInstruction.java (2 lines):
	- line 85: // TODO: perf
	- line 114: //TODO reconsider exact value mapping numeric/decimal


src/main/java/org/apache/sysds/parser/ParForStatementBlock.java (1 line):
	- line 258: *   (TODO: in order to remove the last restriction, dependencies must be checked again after


src/main/java/org/apache/sysds/runtime/instructions/fed/QuaternaryFEDInstruction.java (1 line):
	- line 196: // TODO: don't perform replacement over the whole instruction string, possibly changing string literals,


src/main/java/org/apache/sysds/runtime/instructions/spark/utils/RDDConverterUtilsExt.java (1 line):
	- line 110: // TODO: Double-check if synchronization is required here.


src/main/java/org/apache/sysds/runtime/iogen/template/FrameGenerateReaderParallel.java (1 line):
	- line 204: // TODO: implement parallel reader for input stream


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixNative.java (1 line):
	- line 176: //TODO flip upper triangular matrix down for consistent


src/main/java/org/apache/sysds/runtime/compress/colgroup/ASDCZero.java (1 line):
	- line 212: // TODO make sparse decompression where the iterator is known in argument


src/main/python/systemds/scuro/aligner/alignment_strategy.py (1 line):
	- line 40: # TODO: Add additional alignment methods


src/main/java/org/apache/sysds/parser/FunctionStatementBlock.java (1 line):
	- line 38: *  TODO: DRB:  This needs to be changed to reflect:


src/main/java/org/apache/sysds/hops/LeftIndexingOp.java (1 line):
	- line 197: //TODO also use worstcase estimate for output


src/main/java/org/apache/sysds/runtime/controlprogram/caching/MatrixObject.java (1 line):
	- line 524: // TODO sparse optimization


src/main/java/org/apache/sysds/api/mlcontext/MLContextConversionUtil.java (1 line):
	- line 375: // TODO extend frame schema by column names (right now dropped)


src/main/python/systemds/script_building/dag.py (1 line):
	- line 61: # TODO why do we not want to store the results? The execution script will should stay the same


src/main/java/org/apache/sysds/runtime/instructions/spark/functions/CopyTensorBlockPairFunction.java (1 line):
	- line 64: // TODO: always create deep copies in more memory-efficient CSR representation


src/main/java/org/apache/sysds/runtime/io/FrameReaderJSONL.java (1 line):
	- line 118: // TODO Needs Optimisation! "split" is inefficient


src/main/java/org/apache/sysds/runtime/data/DenseBlockBool.java (1 line):
	- line 185: //TODO perf computed indexes


src/main/java/org/apache/sysds/runtime/controlprogram/parfor/DataPartitionerRemoteSparkMapper.java (1 line):
	- line 41: * TODO extend impl for binarycell and textcell


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDNN.java (1 line):
	- line 339: // TODO: Handle sparse image and dout cases:


src/main/java/org/apache/sysds/runtime/instructions/cp/BinaryTensorTensorCPInstruction.java (1 line):
	- line 47: // TODO Ensure right dense/sparse output representation (guarded by released input memory)


src/main/java/org/apache/sysds/runtime/instructions/spark/CheckpointSPInstruction.java (1 line):
	- line 84: // TODO: Synchronize. Avoid double execution


src/main/java/org/apache/sysds/runtime/io/TensorWriterTextCellParallel.java (1 line):
	- line 43: // TODO accurate estimation


src/main/java/org/apache/sysds/runtime/transform/encode/EncoderOmit.java (1 line):
	- line 162: // TODO perf evaluate if column-wise scan more efficient


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederatedWorkloadAnalyzer.java (1 line):
	- line 70: // TODO: Count transitive closure via lineage


src/main/java/org/apache/sysds/runtime/compress/lib/CLALibBinCompress.java (1 line):
	- line 49: // FIXME Optional: recompress, else can be removed (lines 54-55) once fixed compression


src/main/java/org/apache/sysds/runtime/instructions/spark/WriteSPInstruction.java (1 line):
	- line 331: // TODO: implement for libsvm


src/main/java/org/apache/sysds/lops/Checkpoint.java (1 line):
	- line 52: * TODO change string parameter storage.level to StorageLevel as soon as we can assume


src/main/java/org/apache/sysds/lops/UAggOuterChain.java (1 line):
	- line 34: * TODO Currently this lop only support the right hand side in distributed cache. This


src/main/java/org/apache/sysds/runtime/compress/plan/CompressionPlanFactory.java (1 line):
	- line 64: // TODO check for overlapping


src/main/java/org/apache/sysds/runtime/instructions/cp/AggregateUnaryCPInstruction.java (1 line):
	- line 259: // TODO support DataTensor


src/main/java/org/apache/sysds/runtime/data/SparseBlockMCSC.java (1 line):
	- line 35: * TODO implement row interface of sparse blocks (can be slow but must be correct;


src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupSDCFOR.java (1 line):
	- line 110: // TODO add support for changing to SDCSINGLE.


src/main/java/org/apache/sysds/runtime/compress/colgroup/scheme/ConstScheme.java (1 line):
	- line 83: // TODO specialize for sparse data. But would only be used in rare cases


src/main/java/org/apache/sysds/runtime/io/ListWriter.java (1 line):
	- line 67: //TODO additional parallelization over objects (in addition to parallel writers)


src/main/java/org/apache/sysds/runtime/data/SparseBlockCOO.java (1 line):
	- line 783: //TODO specialize for COO, but but equivalent to existing sparse ops


src/main/java/org/apache/sysds/runtime/functionobjects/ParameterizedBuiltin.java (1 line):
	- line 322: // TODO: more accurate distribution-specific computation of upper tail probabilities


src/main/java/org/apache/sysds/hops/cost/CostEstimationWrapper.java (1 line):
	- line 49: //TODO config parameter?


src/main/java/org/apache/sysds/runtime/instructions/cp/KahanObject.java (1 line):
	- line 100: // TODO Auto-generated method stub


src/main/java/org/apache/sysds/hops/rewrite/RewriteRemoveReadAfterWrite.java (1 line):
	- line 65: || writes.get(rfname).getEndLine()<rhop.getEndLine()) ) //note: account for bug in line handling, TODO remove after line handling resolved


src/main/java/org/apache/sysds/runtime/matrix/data/MatrixBlock.java (1 line):
	- line 5293: //TODO: Find the optimum k during compilation


src/main/java/org/apache/sysds/runtime/compress/colgroup/scheme/DDCScheme.java (1 line):
	- line 28: // TODO make it into a soft reference


src/main/java/org/apache/sysds/runtime/instructions/fed/MMFEDInstruction.java (1 line):
	- line 82: //TODO cleanup unnecessary redundancy


src/main/java/org/apache/sysds/hops/estim/EstimatorBitsetMM.java (1 line):
	- line 119: //TODO implement all as bitset operations in both BitsetMatrix1 and BitsetMatrix2


src/main/java/org/apache/sysds/runtime/util/ProgramConverter.java (1 line):
	- line 115: //TODO: rewrite class to instance-based invocation (grown gradually and now inappropriate design)


src/main/java/org/apache/sysds/runtime/data/DenseBlockFP64DEDUP.java (1 line):
	- line 33: //TODO: implement estimator for nr of distinct


src/main/python/systemds/scuro/dataloader/base_loader.py (1 line):
	- line 40: )  # TODO: check what the index should be for storing the metadata (file_name, counter, ...)


src/main/java/org/apache/sysds/lops/compile/linearization/LinearizerMaxParallelism.java (1 line):
	- line 193: //FIXME: Rewire _inputParams when needed (e.g. GroupedAggregate)


src/main/java/org/apache/sysds/runtime/compress/lib/CLALibStack.java (1 line):
	- line 65: // TODO utilize the known size of m to extrapolate how many row blocks there are


src/main/java/org/apache/sysds/lops/compile/Dag.java (1 line):
	- line 372: // TODO find a more direct way of communicating the privacy constraints


src/main/java/org/apache/sysds/runtime/io/ReaderWriterFederated.java (1 line):
	- line 93: * TODO add writing to each of the federated locations so that they also save their matrices.


src/main/java/org/apache/sysds/runtime/instructions/gpu/context/ExecutionConfig.java (1 line):
	- line 147: // TODO: Use JCudaDriver.cuOccupancyMaxPotentialBlockSize to chose the block size that maximizes occupancy


src/main/java/org/apache/sysds/runtime/data/DataTensorBlock.java (1 line):
	- line 229: // TODO sparse


src/main/java/org/apache/sysds/runtime/matrix/data/sketch/countdistinctapprox/SmallestPriorityQueue.java (1 line):
	- line 33: * TODO: Replace Standard Java Set and Priority Queue with optimized versions.


src/main/java/org/apache/sysds/hops/estim/EstimatorDensityMap.java (1 line):
	- line 121: //TODO simple append not possible due to partial blocks at end of m1Map


src/main/java/org/apache/sysds/parser/dml/Dml.g4 (1 line):
	- line 61: | // TODO: Throw an informative error if user doesnot provide the optional assignment


src/main/java/org/apache/sysds/lops/MMRJ.java (1 line):
	- line 62: // FIXME boolean toCache = getOutputParameters().getLinCacheMarking();


src/main/python/systemds/scuro/representations/aggregate.py (1 line):
	- line 26: # TODO: make this a Representation and add a fusion method that fuses two modalities with each other


src/main/java/org/apache/sysds/runtime/instructions/fed/QuantileSortFEDInstruction.java (1 line):
	- line 143: // TODO make sure that qsort result is used by qpick only where the main operation happens


src/main/java/org/apache/sysds/runtime/instructions/cp/MatrixBuiltinNaryCPInstruction.java (1 line):
	- line 60: //TODO native nary frame append


src/main/java/org/apache/sysds/hops/NaryOp.java (1 line):
	- line 168: //TODO: cbind/rbind of lists only support in CP right now


src/main/java/org/apache/sysds/runtime/controlprogram/paramserv/homomorphicEncryption/SEALClient.java (1 line):
	- line 33: // TODO take params here, like slot_count etc.


src/main/java/org/apache/sysds/hops/rewrite/RewriteSplitDagDataDependentOperators.java (1 line):
	- line 66: * TODO: Cleanup runtime to never access individual statements of potentially


src/main/java/org/apache/sysds/runtime/transform/encode/EncoderFactory.java (1 line):
	- line 254: //TODO replace with columnEncoder.getType().ordinal


src/main/java/org/apache/sysds/runtime/iogen/ReaderMappingIndex.java (1 line):
	- line 233: // TODO: array properties for multi-line


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederatedWorker.java (1 line):
	- line 192: // TODO add ability to use real ssl files, not self signed certificates.


src/main/java/org/apache/sysds/runtime/instructions/cp/TriggerPrefetchTask.java (1 line):
	- line 54: // TODO: Add robust runtime constraints for federated prefetch


src/main/java/org/apache/sysds/runtime/instructions/fed/UnaryFEDInstruction.java (1 line):
	- line 199: //TODO: simplify once all fed instructions have consistent flags


src/main/java/org/apache/sysds/runtime/frame/data/columns/DDCArray.java (1 line):
	- line 228: // TODO add append compressed to each other.


src/main/java/org/apache/sysds/runtime/lineage/Lineage.java (1 line):
	- line 58: //Silently skip toString. TODO: trace toString


src/main/java/org/apache/sysds/runtime/instructions/cp/TriggerCheckpointTask.java (1 line):
	- line 39: // FIXME: Handle double execution


src/main/java/org/apache/sysds/runtime/iogen/ReaderMapping.java (1 line):
	- line 232: // TODO: array properties for multi-line


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixCuDNNConvolutionAlgorithm.java (1 line):
	- line 134: // FIXME: cudnnGetConvolutionForwardAlgorithm method returns CUDNN_CONVOLUTION_FWD_ALGO_IMPLICIT_PRECOMP_GEMM


src/main/java/org/apache/sysds/runtime/io/cog/COGHeader.java (1 line):
	- line 418: // TODO: LZW would be a great addition as it is widely used


src/main/java/org/apache/sysds/runtime/lineage/LineageEstimatorStatistics.java (1 line):
	- line 37: // TODO: Handle overflow


src/main/java/org/apache/sysds/runtime/transform/meta/TfMetaUtils.java (1 line):
	- line 86: * TODO consolidate external and internal json spec definitions


src/main/java/org/apache/sysds/lops/Unary.java (1 line):
	- line 128: //TODO extend for all basic unary operations


src/main/java/org/apache/sysds/runtime/compress/lib/CLALibReorg.java (1 line):
	- line 114: // TODO: parallelize


src/main/java/org/apache/sysds/runtime/instructions/fed/AggregateUnaryFEDInstruction.java (1 line):
	- line 77: // TODO: during processing the NONE-flag of AggregateUnarySPInstruction (SparkAggType) will be removed, making the instruction unparseable


src/main/java/org/apache/sysds/runtime/instructions/cp/ScalarObjectFactory.java (1 line):
	- line 50: //TODO add new scalar object for extended type system


src/main/java/org/apache/sysds/hops/rewrite/RewriteBlockSizeAndReblock.java (1 line):
	- line 121: // TODO: following two lines are commented, and the subsequent hack is used instead!


src/main/java/org/apache/sysds/lops/compile/linearization/LinearizerResourceAwareOptimal.java (1 line):
	- line 33: // FIXME this implementation does not terminate (even for toy examples)


src/main/java/org/apache/sysds/runtime/controlprogram/context/ExecutionContext.java (1 line):
	- line 893: // TODO bra: store all newly created lis in active list


src/main/java/org/apache/sysds/runtime/compress/CompressedMatrixBlock.java (1 line):
	- line 682: // TODO parallel contains value


scripts/staging/sklearn/mappers/supervised.py (1 line):
	- line 52: # TODO: many parameters cannot be mapped directly:


src/main/java/org/apache/sysds/runtime/frame/data/columns/HashIntegerArray.java (1 line):
	- line 294: // TODO use Array Copy for improved speed.


src/main/java/org/apache/sysds/runtime/controlprogram/federated/FederatedRequest.java (1 line):
	- line 134: // TODO: append lineageitem hash if checksum is not enough


src/main/java/org/apache/sysds/runtime/instructions/fed/AggregateBinaryFEDInstruction.java (1 line):
	- line 98: //TODO cleanup unnecessary redundancy


src/main/java/org/apache/sysds/hops/estim/EstimatorMatrixHistogram.java (1 line):
	- line 569: //TODO generalize implementation for partial fractions


src/main/java/org/apache/sysds/runtime/matrix/data/SinglePrecisionCudaSupportFunctions.java (1 line):
	- line 202: // TODO: Perform conversion on GPU using double2float and float2double kernels


src/main/java/org/apache/sysds/hops/codegen/template/TemplateOuterProduct.java (1 line):
	- line 237: /* TODO find out why we need to propagate this at all


src/main/java/org/apache/sysds/runtime/instructions/cp/QuantilePickCPInstruction.java (1 line):
	- line 56: //TODO this should be refactored to use pickvaluecount lops


src/main/java/org/apache/sysds/runtime/instructions/fed/CtableFEDInstruction.java (1 line):
	- line 70: // TODO: add support for new tableexpand intruction.


src/main/java/org/apache/sysds/runtime/instructions/gpu/MatrixMatrixArithmeticGPUInstruction.java (1 line):
	- line 44: //TODO: make hop level changes for this


src/main/java/org/apache/sysds/runtime/instructions/cp/ParameterizedBuiltinCPInstruction.java (1 line):
	- line 415: // TODO improve truncation to check all dimensions


src/main/java/org/apache/sysds/runtime/controlprogram/parfor/RemoteParForSpark.java (1 line):
	- line 59: * TODO reducebykey on variable names


src/main/java/org/apache/sysds/runtime/controlprogram/parfor/opt/CostEstimator.java (1 line):
	- line 33: * TODO account for shared read-only matrices when computing aggregated stats


src/main/java/org/apache/sysds/runtime/controlprogram/paramserv/ParamServer.java (1 line):
	- line 547: //TODO double check correctness with multiple, potentially concurrent paramserv invocation


src/main/cuda/headers/utils.cuh (1 line):
	- line 112: // TODO: Use __double2float_rd or __double2float_rn  or __double2float_ru or


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDNNPooling.java (1 line):
	- line 680: //TODO exploit constant value and overlap for potential early abort


src/main/java/org/apache/sysds/hops/codegen/cplan/CNodeCell.java (1 line):
	- line 146: // TODO: workaround to fix name clash of cell and row template


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDNNConv2d.java (1 line):
	- line 594: // TODO: Support sparse native convolution operations without dense intermediates + dense matmult


src/main/java/org/apache/sysds/runtime/matrix/data/LibCommonsMath.java (1 line):
	- line 811: * TODO: use Householder transformation and implicit shifts to further speed up QR decompositions


src/main/java/org/apache/sysds/lops/OperatorOrderingUtils.java (1 line):
	- line 139: //TODO: Handle Lops with mixed Spark (broadcast) CP consumers


src/main/java/org/apache/sysds/lops/AppendG.java (1 line):
	- line 29: * TODO Additional compiler enhancements:


src/main/java/org/apache/sysds/hops/AggUnaryOp.java (1 line):
	- line 432: // TODO: Disable ternary aggregate rewrite on GPU backend.


src/main/java/org/apache/sysds/runtime/compress/colgroup/dictionary/MatrixBlockDictionary.java (1 line):
	- line 2613: // TODO add sparse exploitation.


src/main/java/org/apache/sysds/runtime/controlprogram/context/MatrixObjectFuture.java (1 line):
	- line 88: // FIXME: start time should indicate the actual start of the execution


src/main/java/org/apache/sysds/lops/FunctionCallCP.java (1 line):
	- line 178: // TODO function output dataops (phase 3) - take 'outputs' into account


src/main/java/org/apache/sysds/runtime/io/FrameReaderFactory.java (1 line):
	- line 52: // TODO performance improvement: add parallel reader


src/main/java/org/apache/sysds/runtime/instructions/cp/ListIndexingCPInstruction.java (1 line):
	- line 70: //TODO: copy the lineage trace of input2 list to input1 list


src/main/python/systemds/utils/converters.py (1 line):
	- line 254: # TODO maybe it is more efficient to bit pack the booleans.


src/main/java/org/apache/sysds/runtime/compress/lib/CLALibBinaryCellOp.java (1 line):
	- line 224: else// TODO add decompress into and apply for row operations.


src/main/java/org/apache/sysds/hops/codegen/cplan/CNodeRow.java (1 line):
	- line 185: // TODO Auto-generated method stub


src/main/java/org/apache/sysds/parser/DMLTranslator.java (1 line):
	- line 2881: @SuppressWarnings("unused") //TODO remove if not used


src/main/cpp/he/libhe.cpp (1 line):
	- line 272: // FIXME: this copies encrypted_sum, which is unnecessary


src/main/java/org/apache/sysds/parser/ParameterizedBuiltinFunctionExpression.java (1 line):
	- line 292: // TODO dimension should be set to -1 but could not set due to lineage parsing error in Spark context


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixSketch.java (1 line):
	- line 36: // TODO optimize for dense/sparse/compressed (once multi-column support added)


src/main/java/org/apache/sysds/runtime/io/TensorWriterBinaryBlock.java (1 line):
	- line 36: //TODO replication


src/main/java/org/apache/sysds/runtime/instructions/cp/TriggerBroadcastTask.java (1 line):
	- line 47: //TODO: Count only if successful (owned lock)


src/main/python/systemds/scuro/modality/type.py (1 line):
	- line 28: # TODO: needs a way to define if data comes from a dataset with multiple instances or is like a streaming scenario where we only have one instance


src/main/java/org/apache/sysds/runtime/instructions/cp/ScalarObject.java (1 line):
	- line 41: //TODO: Get the actual sizes by using profilers (JOL/Instrumentation) and hardcode in here.


src/main/java/org/apache/sysds/hops/cost/ComputeCost.java (1 line):
	- line 81: case SINH:    costs = 93; break; // TODO:


src/main/java/org/apache/sysds/runtime/data/SparseBlockCSC.java (1 line):
	- line 46: * TODO performance - currently this sparse block is very slow and this slows down even the component tests


src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDNNLSTM.java (1 line):
	- line 332: //TODO elias: currently we apply operator each on the whole batch,


src/main/java/org/apache/sysds/utils/stats/TransformStatistics.java (1 line):
	- line 161: //TODO: Cleanup and condense


src/main/python/systemds/operator/algorithm/builtin/correctTyposApply.py (1 line):
	- line 50: TODO: future: add parameter for list of words that are sure to be correct


src/main/java/org/apache/sysds/hops/ReorgOp.java (1 line):
	- line 446: // TODO size information for tensor


src/main/java/org/apache/sysds/runtime/instructions/cp/AggregateBinaryCPInstruction.java (1 line):
	- line 109: // TODO: Use rewrite rule here t(x) %*% y -> t(t(y) %*% x)


src/main/java/org/apache/sysds/runtime/io/cog/COGByteReader.java (1 line):
	- line 79: // TODO: When properly implementing BigTIFF, this could be a problem when not being able to skip bytes


src/main/java/org/apache/sysds/runtime/matrix/data/sketch/countdistinctapprox/KMVSketch.java (1 line):
	- line 43: * TODO: Add multi-threaded version


src/main/java/org/apache/sysds/runtime/instructions/cp/MatrixAppendCPInstruction.java (1 line):
	- line 74: // TODO: break append to cbind and rbind for full compilation chain


src/main/java/org/apache/sysds/lops/DataGen.java (1 line):
	- line 90: // TODO size for tensor


src/main/java/org/apache/sysds/api/mlcontext/MLContextUtil.java (1 line):
	- line 882: str = object.toString(); // TODO: Deal with OOM for other


src/main/java/org/apache/sysds/runtime/lineage/LineageCodegenItem.java (1 line):
	- line 38: //TODO: test with parfor (synchronization, placeholders, etc)


src/main/java/org/apache/sysds/hops/rewrite/RewriteInjectSparkLoopCheckpointing.java (1 line):
	- line 44: * TODO (2) implement injection for multiple consumers (local and global).


src/main/java/org/apache/sysds/runtime/io/WriterTextCSV.java (1 line):
	- line 254: * TODO: Remove this roundabout way!


src/main/java/org/apache/sysds/runtime/instructions/cp/MultiReturnParameterizedBuiltinCPInstruction.java (1 line):
	- line 97: // TODO: Assign #threads in compiler and pass via the instruction string


src/main/java/org/apache/sysds/runtime/instructions/cp/SpoofCPInstruction.java (1 line):
	- line 91: //FIXME fused codegen operators already support compressed main inputs


src/main/python/systemds/scuro/modality/joined_transformed.py (1 line):
	- line 65: ):  # TODO: only if the layout is list_of_lists_of_numpy_array


src/main/java/org/apache/sysds/runtime/instructions/cp/PrefetchCPInstruction.java (1 line):
	- line 46: // TODO: handle non-matrix objects


src/main/java/org/apache/sysds/runtime/io/TensorReaderBinaryBlock.java (1 line):
	- line 61: // TODO reuse blocks


src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupUncompressed.java (1 line):
	- line 941: // TODO add sparse optmization


src/main/java/org/apache/sysds/runtime/compress/colgroup/offset/AOffset.java (1 line):
	- line 598: // TODO add previous command that would allow us to simplify this loop.


src/main/java/org/apache/sysds/runtime/instructions/spark/FrameAppendRSPInstruction.java (1 line):
	- line 74: //TODO preserve info if already aligned, and only align if necessary


src/main/java/org/apache/sysds/runtime/functionobjects/CTable.java (1 line):
	- line 156: * TODO: Support other cases


src/main/java/org/apache/sysds/runtime/iogen/codegen/CodeGenTrie.java (1 line):
	- line 62: // TODO: same pattern for all columns but the ValueTypes are different- fix it !


src/main/java/org/apache/sysds/resource/cost/IOCostUtils.java (1 line):
	- line 527: // TODO: ensure the object related to stats is read in memory already ot add logic to account for its read time