tf.keras.backend.is_sparse

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Returns whether a tensor is a sparse tensor.

Arguments
tensor A tensor instance.
Returns
A boolean.

Example:

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

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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/is_sparse