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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:

a = tf.keras.backend.placeholder((2, 2), sparse=False)
print(tf.keras.backend.is_sparse(a))
False
b = tf.keras.backend.placeholder((2, 2), sparse=True)
print(tf.keras.backend.is_sparse(b))
True

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https://www.tensorflow.org/versions/r2.3/api_docs/python/tf/keras/backend/is_sparse