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Returns a list of (tuple_path, leaf_element) tuples.

The order of pairs 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 about tuple paths.

structure the nested structure to flatten.
expand_composites If true, then composite tensors such as tf.SparseTensor and tf.RaggedTensor are expanded into their component tensors.

A list of (tuple_path, leaf_element) tuples. Each tuple_path is a tuple of indices and/or dictionary keys that uniquely specify the path to leaf_element within structure.