tf.sparse_softmax( sp_input, name=None )
See the guide: Sparse Tensors > Math Operations
Applies softmax to a batched N-D
The inputs represent an N-D SparseTensor with logical shape
[..., B, C] (where
N >= 2), and with indices sorted in the canonical lexicographic order.
This op is equivalent to applying the normal
tf.nn.softmax() to each innermost logical submatrix with shape
[B, C], but with the catch that the implicitly zero elements do not participate. Specifically, the algorithm is equivalent to:
tf.nn.softmax() to a densified view of each innermost submatrix with shape
[B, C], along the size-C dimension; (2) Masks out the original implicitly-zero locations; (3) Renormalizes the remaining elements.
SparseTensor result has exactly the same non-zero indices and shape.
# First batch: # [? e.] # [1. ? ] # Second batch: # [e ? ] # [e e ] shape = [2, 2, 2] # 3-D SparseTensor values = np.asarray([[[0., np.e], [1., 0.]], [[np.e, 0.], [np.e, np.e]]]) indices = np.vstack(np.where(values)).astype(np.int64).T result = tf.sparse_softmax(tf.SparseTensor(indices, values, shape)) # ...returning a 3-D SparseTensor, equivalent to: # [? 1.] [1 ?] # [1. ? ] and [.5 .5] # where ? means implicitly zero.
N >= 2.
name: optional name of the operation.
SparseTensorrepresenting the results.
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Code samples licensed under the Apache 2.0 License.