Missing support for ReverseV2 op

[narrietal]

ReverseV2 is a TF operator used for bidirectional RNNs. I am in need of using it in TFLM.

Back in 2019 it was added to the repo in this commit: rkuester/tensorflow@d5ee710 and today some traces of it can be found in

tflite-micro/tensorflow/lite/builtin_ops.h

Line 135 in ef64591

kTfLiteBuiltinReverseV2 = 105,

.

However, the kernel from such op is missing from the list of lite kernels: https://github.com/tensorflow/tflite-micro/tree/main/tensorflow/lite/kernels/internal/reference

I would be eager to port myself the operation from lite to micro following this guide, however, the guide seems outdated and, as I mentioned before, the kernel for the lite list is missing.

Any plans on including back such an operation? Is there anything we can do to help?

What is the recommended approach to port bidirectional RNNs to TFLM if the ReverseV2 op. cannot be used?