tf.keras.backend.to_dense

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Converts a sparse tensor into a dense tensor and returns it.

Arguments
tensor A tensor instance (potentially sparse).
Returns
A dense tensor.

Examples:

from keras import backend as K
b = K.placeholder((2, 2), sparse=True)
print(K.is_sparse(b))
True
c = K.to_dense(b)
print(K.is_sparse(c))
False

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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/keras/backend/to_dense