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Returns a list of (string path, data element) tuples.

The order of tuples produced matches that of nest.flatten. This allows you to flatten a nested structure while keeping information about where in the structure each data element was located. See nest.yield_flat_paths for more information.

structure the nested structure to flatten.
separator string to separate levels of hierarchy in the results, defaults to '/'.
expand_composites If true, then composite tensors such as tf.SparseTensor and tf.RaggedTensor are expanded into their component tensors.

A list of (string, data element) tuples.