// Returning null tensors from a tf.function is not supported, so we keep
    // track of indices in the model's outputs are nullptr in this set.
    // The FunctionDef only outputs the non-null tensors. We later pad the
    // function op outputs to have nullptrs at the `null_indices`.
    absl::flat_hash_set<int> null_indices;
    {
      AbstractContextPtr func_ctx(BuildFunction(fn_name));

    *   Preprocessing layers API consistency changes:
        *   `StringLookup` added `output_mode`, `sparse`, and
            `pad_to_max_tokens` arguments with same semantics as
            `TextVectorization`.
        *   `IntegerLookup` added `output_mode`, `sparse`, and
            `pad_to_max_tokens` arguments with same semantics as
            `TextVectorization`. Renamed `max_values`, `oov_value` and

# MACOS ARM64 WHEEL
test:macos_arm64_wheel_test_filters --test_tag_filters=-no_oss,-oss_excluded,-oss_serial,-no_oss_py39,-no_oss_py310,-nomac,-no_mac,-mac_excluded,-v1only,-gpu,-tpu,-benchmark-test,-no_mac_arm64,-no_aarch64