Source code for jina.types.ndarray.sparse.pytorch

from typing import List

import torch
import numpy as np
from torch.sparse import FloatTensor

from . import BaseSparseNdArray
from ....proto import jina_pb2

if False:
    import numpy as np

__all__ = ['SparseNdArray']

[docs]class SparseNdArray(BaseSparseNdArray): """ Pytorch powered sparse ndarray, i.e. FloatTensor. .. seealso:: :param proto: protobuf instance, default is None. :param transpose_indices: in torch, the input to LongTensor is NOT a list of index tuples. :param args: positional arguments. :param kwargs: positional key value arguments. If you want to write your indices this way, you should transpose before passing them to the sparse constructor .. note:: To comply with Tensorflow, `transpose_indices` is set to True by default """ def __init__( self, proto: 'jina_pb2.SparseNdArrayProto' = None, transpose_indices: bool = True, *args, **kwargs ): super().__init__(proto, *args, **kwargs) self.transpose_indices = transpose_indices
[docs] def sparse_constructor( self, indices: 'np.ndarray', values: 'np.ndarray', shape: List[int] ) -> 'FloatTensor': """ Sparse NdArray constructor for FloatTensor. :param indices: the indices of the sparse array :param values: the values of the sparse array :param shape: the shape of the sparse array :return: FloatTensor """ return FloatTensor( torch.LongTensor(indices).T if self.transpose_indices else torch.LongTensor(indices), torch.FloatTensor(values), torch.Size(shape), )
[docs] def sparse_parser(self, value: 'FloatTensor'): """ Parse a FloatTensor to indices, values and shape. :param value: the FloatTensor. :return: a Dict with three entries {'indices': ..., 'values':..., 'shape':...} """ indices = value._indices().numpy() if self.transpose_indices: indices = indices.T values = value._values().numpy() shape = list(value.size()) return { 'indices': indices, 'values': values, 'shape': shape, }