void bind_vo_sketch()

in src/vo_wrapper.cpp [34:100]

• 66 lines of code
• 2 McCabe index (conditional complexity)

void bind_vo_sketch(nb::module_ &m, const char* name) {
  using namespace datasketches;

  nb::class_<var_opt_sketch<T>>(m, name)
    .def(nb::init<uint32_t>(), nb::arg("k"),
         "Creates a new Var Opt sketch instance\n\n"
         ":param k: Maximum number of samples in the sketch\n:type k: int\n"
    )
    .def("__copy__", [](const var_opt_sketch<T>& sk){ return var_opt_sketch<T>(sk); })
    .def("__str__", [](const var_opt_sketch<T>& sk) { return sk.to_string(); },
         "Produces a string summary of the sketch")
    .def("to_string",
         [](const var_opt_sketch<T>& sk, bool print_items) {
           std::ostringstream ss;
           ss << sk.to_string();
           if (print_items)
             ss << sk.items_to_string();
           return ss.str();
         }, nb::arg("print_items")=false,
         "Produces a string summary of the sketch and optionally prints the items")
    .def("update", (void (var_opt_sketch<T>::*)(const T&, double)) &var_opt_sketch<T>::update, nb::arg("item"), nb::arg("weight")=1.0,
         "Updates the sketch with the given value and weight")
    .def_prop_ro("k", &var_opt_sketch<T>::get_k,
         "Returns the sketch's maximum configured sample size")
    .def_prop_ro("n", &var_opt_sketch<T>::get_n,
         "Returns the total stream length")
    .def_prop_ro("num_samples", &var_opt_sketch<T>::get_num_samples,
         "Returns the number of samples currently in the sketch")
    .def("is_empty", &var_opt_sketch<T>::is_empty,
         "Returns True if the sketch is empty, otherwise False")
    .def("estimate_subset_sum",
         [](const var_opt_sketch<T>& sk, const std::function<bool(T)> func) {
           subset_summary summary = sk.estimate_subset_sum(func);
           nb::dict d;
           d["estimate"] = summary.estimate;
           d["lower_bound"] = summary.lower_bound;
           d["upper_bound"] = summary.upper_bound;
           d["total_sketch_weight"] = summary.total_sketch_weight;
           return d;
         }, nb::arg("predicate"),
         "Applies a provided predicate to the sketch and returns the estimated total weight matching the predicate, as well "
         "as upper and lower bounds on the estimate and the total weight processed by the sketch")
    .def("get_serialized_size_bytes",
         [](const var_opt_sketch<T>& sk, py_object_serde& serde) { return sk.get_serialized_size_bytes(serde); },
         nb::arg("serde"),
         "Computes the size in bytes needed to serialize the current sketch")
    .def("serialize",
         [](const var_opt_sketch<T>& sk, py_object_serde& serde) {
           auto bytes = sk.serialize(0, serde);
           return nb::bytes(reinterpret_cast<const char*>(bytes.data()), bytes.size());
         }, nb::arg("serde"),
         "Serializes the sketch into a bytes object")
    .def_static(
         "deserialize",
         [](const nb::bytes& bytes, py_object_serde& serde) { return var_opt_sketch<T>::deserialize(bytes.c_str(), bytes.size(), serde); },
         nb::arg("bytes"), nb::arg("serde"),
         "Reads a bytes object and returns the corresponding var opt sketch")
    .def("__iter__",
          [](const var_opt_sketch<T>& sk) {
               return nb::make_iterator(nb::type<var_opt_sketch<T>>(),
               "var_opt_iterator",
               sk.begin(),
               sk.end());
          }, nb::keep_alive<0,1>()
     )
     ;
}