*   Update docstring for gather to properly describe the non-empty `batch_dims`
    case.
*   Added `tf.sparse.from_dense` utility function.
*   Improved ragged tensor support in `TensorFlowTestCase`.
*   Makes the a-normal form transformation in Pyct configurable as to which
    nodes are converted to variables and which are not.
*   `ResizeInputTensor` now works for all delegates.
*   Add `EXPAND_DIMS` support to NN API delegate TEST: expand_dims_test