eland/ml/pytorch/transformers.py

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"""
Support for and interoperability with HuggingFace transformers and related
libraries such as sentence-transformers.
"""

import json
import os.path
import random
import re
from abc import ABC, abstractmethod
from typing import Dict, List, Optional, Set, Tuple, Union

import torch  # type: ignore
import transformers  # type: ignore
from torch import Tensor
from torch.profiler import profile  # type: ignore
from transformers import (
    BertTokenizer,
    PretrainedConfig,
    PreTrainedModel,
    PreTrainedTokenizer,
    PreTrainedTokenizerFast,
)

from eland.ml.pytorch.nlp_ml_model import (
    FillMaskInferenceOptions,
    NerInferenceOptions,
    NlpBertJapaneseTokenizationConfig,
    NlpBertTokenizationConfig,
    NlpDebertaV2TokenizationConfig,
    NlpMPNetTokenizationConfig,
    NlpRobertaTokenizationConfig,
    NlpTokenizationConfig,
    NlpTrainedModelConfig,
    NlpXLMRobertaTokenizationConfig,
    PassThroughInferenceOptions,
    PrefixStrings,
    QuestionAnsweringInferenceOptions,
    TextClassificationInferenceOptions,
    TextEmbeddingInferenceOptions,
    TextExpansionInferenceOptions,
    TextSimilarityInferenceOptions,
    TrainedModelInput,
    ZeroShotClassificationInferenceOptions,
)
from eland.ml.pytorch.traceable_model import TraceableModel
from eland.ml.pytorch.wrappers import (
    _DistilBertWrapper,
    _DPREncoderWrapper,
    _QuestionAnsweringWrapperModule,
    _SentenceTransformerWrapperModule,
)

SUPPORTED_TASK_TYPES = {
    "fill_mask",
    "ner",
    "pass_through",
    "text_classification",
    "text_embedding",
    "text_expansion",
    "zero_shot_classification",
    "question_answering",
    "text_similarity",
}
ARCHITECTURE_TO_TASK_TYPE = {
    "MaskedLM": ["fill_mask", "text_embedding"],
    "TokenClassification": ["ner"],
    "SequenceClassification": [
        "text_classification",
        "zero_shot_classification",
        "text_similarity",
    ],
    "QuestionAnswering": ["question_answering"],
    "DPRQuestionEncoder": ["text_embedding"],
    "DPRContextEncoder": ["text_embedding"],
}
ZERO_SHOT_LABELS = {"contradiction", "neutral", "entailment"}
TASK_TYPE_TO_INFERENCE_CONFIG = {
    "fill_mask": FillMaskInferenceOptions,
    "ner": NerInferenceOptions,
    "text_expansion": TextExpansionInferenceOptions,
    "text_classification": TextClassificationInferenceOptions,
    "text_embedding": TextEmbeddingInferenceOptions,
    "zero_shot_classification": ZeroShotClassificationInferenceOptions,
    "pass_through": PassThroughInferenceOptions,
    "question_answering": QuestionAnsweringInferenceOptions,
    "text_similarity": TextSimilarityInferenceOptions,
}
SUPPORTED_TASK_TYPES_NAMES = ", ".join(sorted(SUPPORTED_TASK_TYPES))
SUPPORTED_TOKENIZERS = (
    transformers.BertTokenizer,
    transformers.BertJapaneseTokenizer,
    transformers.MPNetTokenizer,
    transformers.DPRContextEncoderTokenizer,
    transformers.DPRQuestionEncoderTokenizer,
    transformers.DistilBertTokenizer,
    transformers.ElectraTokenizer,
    transformers.MobileBertTokenizer,
    transformers.RetriBertTokenizer,
    transformers.RobertaTokenizer,
    transformers.BartTokenizer,
    transformers.SqueezeBertTokenizer,
    transformers.XLMRobertaTokenizer,
    transformers.DebertaV2Tokenizer,
)
SUPPORTED_TOKENIZERS_NAMES = ", ".join(sorted([str(x) for x in SUPPORTED_TOKENIZERS]))

TracedModelTypes = Union[
    torch.nn.Module,
    torch.ScriptModule,
    torch.jit.ScriptModule,
    torch.jit.TopLevelTracedModule,
]


class TaskTypeError(Exception):
    pass


class UnknownModelInputSizeError(Exception):
    pass


def task_type_from_model_config(model_config: PretrainedConfig) -> Optional[str]:
    if model_config.architectures is None:
        if model_config.name_or_path.startswith("sentence-transformers/"):
            return "text_embedding"
        return None
    potential_task_types: Set[str] = set()
    for architecture in model_config.architectures:
        for substr, task_type in ARCHITECTURE_TO_TASK_TYPE.items():
            if substr in architecture:
                for t in task_type:
                    potential_task_types.add(t)
    if len(potential_task_types) == 0:
        if model_config.name_or_path.startswith("sentence-transformers/"):
            return "text_embedding"
        return None
    if (
        "text_classification" in potential_task_types
        and model_config.id2label
        and len(model_config.id2label) == 1
    ):
        return "text_similarity"
    if len(potential_task_types) > 1:
        if "zero_shot_classification" in potential_task_types:
            if model_config.label2id:
                labels = set([x.lower() for x in model_config.label2id.keys()])
                if len(labels.difference(ZERO_SHOT_LABELS)) == 0:
                    return "zero_shot_classification"
            return "text_classification"
        if "text_embedding" in potential_task_types:
            if model_config.name_or_path.startswith("sentence-transformers/"):
                return "text_embedding"
            return "fill_mask"
    return potential_task_types.pop()


class _TransformerTraceableModel(TraceableModel):
    """A base class representing a HuggingFace transformer model that can be traced."""

    def __init__(
        self,
        tokenizer: Union[PreTrainedTokenizer, PreTrainedTokenizerFast],
        model: Union[
            PreTrainedModel,
            _SentenceTransformerWrapperModule,
            _DPREncoderWrapper,
            _DistilBertWrapper,
        ],
    ):
        super(_TransformerTraceableModel, self).__init__(model=model)
        self._tokenizer = tokenizer

    def _trace(self) -> TracedModelTypes:
        inputs = self._compatible_inputs()
        return torch.jit.trace(self._model, example_inputs=inputs)

    def sample_output(self) -> Tensor:
        inputs = self._compatible_inputs()
        return self._model(*inputs)

    def _compatible_inputs(self) -> Tuple[Tensor, ...]:
        inputs = self._prepare_inputs()

        # Add params when not provided by the tokenizer (e.g. DistilBERT), to conform to BERT interface
        if "token_type_ids" not in inputs:
            inputs["token_type_ids"] = torch.zeros(
                inputs["input_ids"].size(1), dtype=torch.long
            )
        if isinstance(
            self._tokenizer,
            (
                transformers.BartTokenizer,
                transformers.MPNetTokenizer,
                transformers.RobertaTokenizer,
                transformers.XLMRobertaTokenizer,
            ),
        ):
            return (inputs["input_ids"], inputs["attention_mask"])

        if isinstance(self._tokenizer, transformers.DebertaV2Tokenizer):
            return (
                inputs["input_ids"],
                inputs["attention_mask"],
                inputs["token_type_ids"],
            )

        position_ids = torch.arange(inputs["input_ids"].size(1), dtype=torch.long)
        inputs["position_ids"] = position_ids
        return (
            inputs["input_ids"],
            inputs["attention_mask"],
            inputs["token_type_ids"],
            inputs["position_ids"],
        )

    @abstractmethod
    def _prepare_inputs(self) -> transformers.BatchEncoding: ...


class _TraceableClassificationModel(_TransformerTraceableModel, ABC):
    def classification_labels(self) -> Optional[List[str]]:
        id_label_items = self._model.config.id2label.items()
        labels = [v for _, v in sorted(id_label_items, key=lambda kv: kv[0])]

        # Make classes like I-PER into I_PER which fits Java enumerations
        return [label.replace("-", "_") for label in labels]


class _TraceableFillMaskModel(_TransformerTraceableModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "Who was Jim Henson?",
            "[MASK] Henson was a puppeteer",
            padding="max_length",
            return_tensors="pt",
        )


class _TraceableTextExpansionModel(_TransformerTraceableModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "This is an example sentence.",
            padding="max_length",
            return_tensors="pt",
        )


class _TraceableNerModel(_TraceableClassificationModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            (
                "Hugging Face Inc. is a company based in New York City. "
                "Its headquarters are in DUMBO, therefore very close to the Manhattan Bridge."
            ),
            padding="max_length",
            return_tensors="pt",
        )


class _TraceablePassThroughModel(_TransformerTraceableModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "This is an example sentence.",
            padding="max_length",
            return_tensors="pt",
        )


class _TraceableTextClassificationModel(_TraceableClassificationModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "This is an example sentence.",
            padding="max_length",
            return_tensors="pt",
        )


class _TraceableTextEmbeddingModel(_TransformerTraceableModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "This is an example sentence.",
            padding="longest",
            return_tensors="pt",
        )


class _TraceableZeroShotClassificationModel(_TraceableClassificationModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "This is an example sentence.",
            "This example is an example.",
            padding="max_length",
            return_tensors="pt",
        )


class _TraceableQuestionAnsweringModel(_TransformerTraceableModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "What is the meaning of life?"
            "The meaning of life, according to the hitchikers guide, is 42.",
            padding="max_length",
            return_tensors="pt",
        )


class _TraceableTextSimilarityModel(_TransformerTraceableModel):
    def _prepare_inputs(self) -> transformers.BatchEncoding:
        return self._tokenizer(
            "What is the meaning of life?"
            "The meaning of life, according to the hitchikers guide, is 42.",
            padding="max_length",
            return_tensors="pt",
        )


class TransformerModel:
    def __init__(
        self,
        *,
        model_id: str,
        task_type: str,
        es_version: Optional[Tuple[int, int, int]] = None,
        quantize: bool = False,
        access_token: Optional[str] = None,
        ingest_prefix: Optional[str] = None,
        search_prefix: Optional[str] = None,
        max_model_input_size: Optional[int] = None,
    ):
        """
        Loads a model from the Hugging Face repository or local file and creates
        the configuration for upload to Elasticsearch.

        Parameters
        ----------
        model_id: str
            A Hugging Face model Id or a file path to the directory containing
            the model files.

        task_type: str
            One of the supported task types.

        es_version: Optional[Tuple[int, int, int]]
            The Elasticsearch cluster version.
            Certain features are created only if the target cluster is
            a high enough version to support them. If not set only
            universally supported features are added.

        quantize: bool, default False
            Quantize the model.

        access_token: Optional[str]
            For the HuggingFace Hub private model access

        ingest_prefix: Optional[str]
            Prefix string to prepend to input at ingest

        search_prefix: Optional[str]
            Prefix string to prepend to input at search

        max_model_input_size: Optional[int]
            The max model input size counted in tokens.
            Usually this value should be extracted from the model configuration
            but if that is not possible or the data is missing it can be
            explicitly set with this parameter.
        """

        self._model_id = model_id
        self._access_token = access_token
        self._task_type = task_type.replace("-", "_")
        self._ingest_prefix = ingest_prefix
        self._search_prefix = search_prefix
        self._max_model_input_size = max_model_input_size

        # load Hugging Face model and tokenizer
        # use padding in the tokenizer to ensure max length sequences are used for tracing (at call time)
        #  - see: https://huggingface.co/transformers/serialization.html#dummy-inputs-and-standard-lengths
        self._tokenizer = transformers.AutoTokenizer.from_pretrained(
            self._model_id, token=self._access_token, use_fast=False
        )

        # check for a supported tokenizer
        if not isinstance(self._tokenizer, SUPPORTED_TOKENIZERS):
            raise TypeError(
                f"Tokenizer type {self._tokenizer} not supported, must be one of: {SUPPORTED_TOKENIZERS_NAMES}"
            )

        self._traceable_model = self._create_traceable_model()
        if quantize:
            self._traceable_model.quantize()
        self._vocab = self._load_vocab()
        self._config = self._create_config(es_version)

    def _load_vocab(self) -> Dict[str, List[str]]:
        vocab_items = self._tokenizer.get_vocab().items()
        vocabulary = [k for k, _ in sorted(vocab_items, key=lambda kv: kv[1])]
        vocab_obj = {
            "vocabulary": vocabulary,
        }
        ranks = getattr(self._tokenizer, "bpe_ranks", {})
        if len(ranks) > 0:
            merges = [
                " ".join(m) for m, _ in sorted(ranks.items(), key=lambda kv: kv[1])
            ]
            vocab_obj["merges"] = merges

        if isinstance(self._tokenizer, transformers.DebertaV2Tokenizer):
            sp_model = self._tokenizer._tokenizer.spm
        else:
            sp_model = getattr(self._tokenizer, "sp_model", None)

        if sp_model:
            id_correction = getattr(self._tokenizer, "fairseq_offset", 0)
            scores = []
            for _ in range(0, id_correction):
                scores.append(0.0)
            for token_id in range(id_correction, len(vocabulary)):
                try:
                    scores.append(sp_model.get_score(token_id - id_correction))
                except IndexError:
                    scores.append(0.0)
                    pass
            if len(scores) > 0:
                vocab_obj["scores"] = scores
        return vocab_obj

    def _create_tokenization_config(self) -> NlpTokenizationConfig:
        if self._max_model_input_size:
            _max_sequence_length = self._max_model_input_size
        else:
            _max_sequence_length = self._find_max_sequence_length()

        if isinstance(self._tokenizer, transformers.MPNetTokenizer):
            return NlpMPNetTokenizationConfig(
                do_lower_case=getattr(self._tokenizer, "do_lower_case", None),
                max_sequence_length=_max_sequence_length,
            )
        elif isinstance(
            self._tokenizer, (transformers.RobertaTokenizer, transformers.BartTokenizer)
        ):
            return NlpRobertaTokenizationConfig(
                add_prefix_space=getattr(self._tokenizer, "add_prefix_space", None),
                max_sequence_length=_max_sequence_length,
            )
        elif isinstance(self._tokenizer, transformers.XLMRobertaTokenizer):
            return NlpXLMRobertaTokenizationConfig(
                max_sequence_length=_max_sequence_length
            )
        elif isinstance(self._tokenizer, transformers.DebertaV2Tokenizer):
            return NlpDebertaV2TokenizationConfig(
                max_sequence_length=_max_sequence_length,
                do_lower_case=getattr(self._tokenizer, "do_lower_case", None),
            )
        else:
            japanese_morphological_tokenizers = ["mecab"]
            if (
                hasattr(self._tokenizer, "word_tokenizer_type")
                and self._tokenizer.word_tokenizer_type
                in japanese_morphological_tokenizers
            ):
                return NlpBertJapaneseTokenizationConfig(
                    do_lower_case=getattr(self._tokenizer, "do_lower_case", None),
                    max_sequence_length=_max_sequence_length,
                )
            else:
                return NlpBertTokenizationConfig(
                    do_lower_case=getattr(self._tokenizer, "do_lower_case", None),
                    max_sequence_length=_max_sequence_length,
                )

    def _find_max_sequence_length(self) -> int:
        # Sometimes the max_... values are present but contain
        # a random or very large value.
        REASONABLE_MAX_LENGTH = 8192
        max_len = getattr(self._tokenizer, "model_max_length", None)
        if max_len is not None and max_len <= REASONABLE_MAX_LENGTH:
            return int(max_len)

        max_sizes = getattr(self._tokenizer, "max_model_input_sizes", dict())
        max_len = max_sizes.get(self._model_id)
        if max_len is not None and max_len < REASONABLE_MAX_LENGTH:
            return int(max_len)

        if max_sizes:
            # The model id wasn't found in the max sizes dict but
            # if all the values correspond then take that value
            sizes = {size for size in max_sizes.values()}
            if len(sizes) == 1:
                max_len = sizes.pop()
                if max_len is not None and max_len < REASONABLE_MAX_LENGTH:
                    return int(max_len)

        if isinstance(self._tokenizer, BertTokenizer):
            return 512

        raise UnknownModelInputSizeError("Cannot determine model max input length")

    def _create_config(
        self, es_version: Optional[Tuple[int, int, int]]
    ) -> NlpTrainedModelConfig:
        tokenization_config = self._create_tokenization_config()

        # Set squad well known defaults
        if self._task_type == "question_answering":
            tokenization_config.max_sequence_length = 386
            tokenization_config.span = 128
            tokenization_config.truncate = "none"

        if self._task_type == "text_similarity":
            tokenization_config.truncate = "second"

        if self._traceable_model.classification_labels():
            inference_config = TASK_TYPE_TO_INFERENCE_CONFIG[self._task_type](
                tokenization=tokenization_config,
                classification_labels=self._traceable_model.classification_labels(),
            )
        elif self._task_type == "text_embedding":
            # The embedding_size paramater was added in Elasticsearch 8.8
            # If the version is not known use the basic config
            if es_version is None or (es_version[0] <= 8 and es_version[1] < 8):
                inference_config = TASK_TYPE_TO_INFERENCE_CONFIG[self._task_type](
                    tokenization=tokenization_config
                )
            else:
                sample_embedding = self._traceable_model.sample_output()
                if type(sample_embedding) is tuple:
                    text_embedding = sample_embedding[0]
                else:
                    text_embedding = sample_embedding

                embedding_size = text_embedding.size(-1)
                inference_config = TASK_TYPE_TO_INFERENCE_CONFIG[self._task_type](
                    tokenization=tokenization_config,
                    embedding_size=embedding_size,
                )
        else:
            inference_config = TASK_TYPE_TO_INFERENCE_CONFIG[self._task_type](
                tokenization=tokenization_config
            )

        # add static and dynamic memory state size to metadata
        per_deployment_memory_bytes = self._get_per_deployment_memory()

        per_allocation_memory_bytes = self._get_per_allocation_memory(
            tokenization_config.max_sequence_length, 1
        )

        metadata = {
            "per_deployment_memory_bytes": per_deployment_memory_bytes,
            "per_allocation_memory_bytes": per_allocation_memory_bytes,
        }

        prefix_strings = (
            PrefixStrings(
                ingest_prefix=self._ingest_prefix, search_prefix=self._search_prefix
            )
            if self._ingest_prefix or self._search_prefix
            else None
        )
        prefix_strings_supported = es_version is None or es_version >= (8, 12, 0)
        if not prefix_strings_supported and prefix_strings:
            raise Exception(
                f"The Elasticsearch cluster version {es_version} does not support prefix strings. Support was added in version 8.12.0"
            )

        return NlpTrainedModelConfig(
            description=f"Model {self._model_id} for task type '{self._task_type}'",
            model_type="pytorch",
            inference_config=inference_config,
            input=TrainedModelInput(
                field_names=["text_field"],
            ),
            metadata=metadata,
            prefix_strings=prefix_strings,
        )

    def _get_per_deployment_memory(self) -> float:
        """
        Returns the static memory size of the model in bytes.
        """
        psize: float = sum(
            param.nelement() * param.element_size()
            for param in self._traceable_model.model.parameters()
        )
        bsize: float = sum(
            buffer.nelement() * buffer.element_size()
            for buffer in self._traceable_model.model.buffers()
        )
        return psize + bsize

    def _get_per_allocation_memory(
        self, max_seq_length: Optional[int], batch_size: int
    ) -> float:
        """
        Returns the transient memory size of the model in bytes.

        Parameters
        ----------
        max_seq_length : Optional[int]
            Maximum sequence length to use for the model.
        batch_size : int
            Batch size to use for the model.
        """
        activities = [torch.profiler.ProfilerActivity.CPU]

        # Get the memory usage of the model with a batch size of 1.
        inputs_1 = self._get_model_inputs(max_seq_length, 1)
        with profile(activities=activities, profile_memory=True) as prof:
            self._traceable_model.model(*inputs_1)
        mem1: float = prof.key_averages().total_average().cpu_memory_usage

        # This is measuring memory usage of the model with a batch size of 2 and
        # then linearly extrapolating it to get the memory usage of the model for
        # a batch size of batch_size.
        if batch_size == 1:
            return mem1
        inputs_2 = self._get_model_inputs(max_seq_length, 2)
        with profile(activities=activities, profile_memory=True) as prof:
            self._traceable_model.model(*inputs_2)
        mem2: float = prof.key_averages().total_average().cpu_memory_usage
        return mem1 + (mem2 - mem1) * (batch_size - 1)

    def _get_model_inputs(
        self,
        max_length: Optional[int],
        batch_size: int,
    ) -> Tuple[Tensor, ...]:
        """
        Returns a random batch of inputs for the model.

        Parameters
        ----------
        max_length : Optional[int]
            Maximum sequence length to use for the model. Default is 512.
        batch_size : int
            Batch size to use for the model.
        """
        vocab: list[str] = list(self._tokenizer.get_vocab().keys())

        # if optional max_length is not set, set it to 512
        if max_length is None:
            max_length = 512

        # generate random text
        texts: list[str] = [
            " ".join(random.choices(vocab, k=max_length)) for _ in range(batch_size)
        ]

        # tokenize text
        inputs: transformers.BatchEncoding = self._tokenizer(
            texts,
            padding="max_length",
            return_tensors="pt",
            truncation=True,
            max_length=max_length,
        )

        return self._make_inputs_compatible(inputs)

    def _make_inputs_compatible(
        self, inputs: transformers.BatchEncoding
    ) -> Tuple[Tensor, ...]:
        """ "
        Make the input batch format compatible to the model's requirements.

        Parameters
        ----------
        inputs : transformers.BatchEncoding
            The input batch to make compatible.
        """
        # Add params when not provided by the tokenizer (e.g. DistilBERT), to conform to BERT interface
        if "token_type_ids" not in inputs:
            inputs["token_type_ids"] = torch.zeros(
                inputs["input_ids"].size(1), dtype=torch.long
            )
        if isinstance(
            self._tokenizer,
            (
                transformers.BartTokenizer,
                transformers.MPNetTokenizer,
                transformers.RobertaTokenizer,
                transformers.XLMRobertaTokenizer,
            ),
        ):
            del inputs["token_type_ids"]
            return (inputs["input_ids"], inputs["attention_mask"])

        position_ids = torch.arange(inputs["input_ids"].size(1), dtype=torch.long)
        inputs["position_ids"] = position_ids
        return (
            inputs["input_ids"],
            inputs["attention_mask"],
            inputs["token_type_ids"],
            inputs["position_ids"],
        )

    def _create_traceable_model(self) -> _TransformerTraceableModel:
        if self._task_type == "auto":
            model = transformers.AutoModel.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            maybe_task_type = task_type_from_model_config(model.config)
            if maybe_task_type is None:
                raise TaskTypeError(
                    f"Unable to automatically determine task type for model {self._model_id}, please supply task type: {SUPPORTED_TASK_TYPES_NAMES}"
                )
            else:
                self._task_type = maybe_task_type

        if self._task_type == "text_expansion":
            model = transformers.AutoModelForMaskedLM.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            model = _DistilBertWrapper.try_wrapping(model)
            return _TraceableTextExpansionModel(self._tokenizer, model)

        if self._task_type == "fill_mask":
            model = transformers.AutoModelForMaskedLM.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            model = _DistilBertWrapper.try_wrapping(model)
            return _TraceableFillMaskModel(self._tokenizer, model)

        elif self._task_type == "ner":
            model = transformers.AutoModelForTokenClassification.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            model = _DistilBertWrapper.try_wrapping(model)
            return _TraceableNerModel(self._tokenizer, model)

        elif self._task_type == "text_classification":
            model = transformers.AutoModelForSequenceClassification.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            model = _DistilBertWrapper.try_wrapping(model)
            return _TraceableTextClassificationModel(self._tokenizer, model)

        elif self._task_type == "text_embedding":
            model = _DPREncoderWrapper.from_pretrained(
                self._model_id, token=self._access_token
            )
            if not model:
                model = _SentenceTransformerWrapperModule.from_pretrained(
                    self._model_id, self._tokenizer, token=self._access_token
                )
            return _TraceableTextEmbeddingModel(self._tokenizer, model)

        elif self._task_type == "zero_shot_classification":
            model = transformers.AutoModelForSequenceClassification.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            model = _DistilBertWrapper.try_wrapping(model)
            return _TraceableZeroShotClassificationModel(self._tokenizer, model)

        elif self._task_type == "question_answering":
            model = _QuestionAnsweringWrapperModule.from_pretrained(
                self._model_id, token=self._access_token
            )
            return _TraceableQuestionAnsweringModel(self._tokenizer, model)

        elif self._task_type == "text_similarity":
            model = transformers.AutoModelForSequenceClassification.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            model = _DistilBertWrapper.try_wrapping(model)
            return _TraceableTextSimilarityModel(self._tokenizer, model)

        elif self._task_type == "pass_through":
            model = transformers.AutoModel.from_pretrained(
                self._model_id, token=self._access_token, torchscript=True
            )
            return _TraceablePassThroughModel(self._tokenizer, model)

        else:
            raise TypeError(
                f"Task {self._task_type} is not supported, must be one of: {SUPPORTED_TASK_TYPES_NAMES}"
            )

    def elasticsearch_model_id(self) -> str:
        return elasticsearch_model_id(self._model_id)

    def save(self, path: str) -> Tuple[str, NlpTrainedModelConfig, str]:
        # save traced model
        model_path = self._traceable_model.save(path)

        # save vocabulary
        vocab_path = os.path.join(path, "vocabulary.json")
        with open(vocab_path, "w") as outfile:
            json.dump(self._vocab, outfile)

        return model_path, self._config, vocab_path


def elasticsearch_model_id(model_id: str) -> str:
    """
    Elasticsearch model IDs need to be a specific format:
    no special chars, all lowercase, max 64 chars. If the
    Id is longer than 64 charaters take the last 64- in the
    case where the id is long file path this captures the
    model name.

    Ids starting with __ are not valid elasticsearch Ids,
    # this might be the case if model_id is a file path
    """

    id = re.sub(r"[\s\\/]", "__", model_id).lower()[-64:]
    id = id.removeprefix("__")
    return id