<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def expert_to_batch_indices(self):
 """Batch indices corresponding to the examples in the per-expert `Tensor`s. Returns: a list of `num_experts` one-dimensional `Tensor`s with type `tf.int64` and shapes `[expert_batch_size_i]` """

    return tf.split(
        self._batch_index, self._part_sizes_tensor, 0, num=self._num_experts)