Compare Tensors with element-wise comparison and thus be unhashable.
tf.compat.v1.enable_tensor_equality()
Comparing tensors with element-wise allows comparisons such as tf.Variable(1.0) == 1.0. Element-wise equality implies that tensors are unhashable. Thus tensors can no longer be directly used in sets or as a key in a dictionary.
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https://www.tensorflow.org/versions/r2.4/api_docs/python/tf/compat/v1/enable_tensor_equality