Document differences between libtensorflow & libtensorflow_cc

[h-vetinari]

I was wondering about this in the context of conda-forge/staged-recipes#16888, and the recipe here doesn't contain much information, IMO.

This part of the recipe predates my involvement, perhapse @njzjz or someone else from @conda-forge/tensorflow who knows can fill in some gaps?

IMO that could just be a comment in the meta.yaml, but we can also add something to the package-descriptions

[njzjz]

One is C library and another one is C++ library.

[h-vetinari]

Thanks for the quick response... But C++ can use C libraries, so is the C++ lib a superset of the C lib? If not, why?

Also, do both contain CUDA? libtensorflow_cc doesn't seem to use a cuda-compiler, but it has a bigger file footprint than libtensorflow. I realise that there are likely many things (including the naming?) that are coming from upstream, but all that should IMO be obvious (at least) from looking at the meta.yaml

[njzjz]

C API：
https://www.tensorflow.org/install/lang_c
https://github.com/tensorflow/tensorflow/blob/master/tensorflow/c/c_api.h

C++ API:
https://www.tensorflow.org/api_docs/cc

In fact, TensorFlow's C API is based on the C++ API, but just rewrites the interface. They have the same core.

So both of them supports CUDA (built by bazel).

[h-vetinari]

In fact, TensorFlow's C API is based on the C++ API, but just rewrites the interface. They have the same core.

Cool thanks. Do you see a chance that we could share "the same core" here between the two libraries? As it is, both are pretty heavyweight at 250-300MB, and that sounds like unnecessary duplication.

[njzjz]

In fact, TensorFlow's C API is based on the C++ API, but just rewrites the interface. They have the same core.

Cool thanks. Do you see a chance that we could share "the same core" here between the two libraries? As it is, both are pretty heavyweight at 250-300MB, and that sounds like unnecessary duplication.

Two libraries are defined here:
https://github.com/tensorflow/tensorflow/blob/fd72ea470038a431ddfafd7510c307362a775cab/tensorflow/BUILD#L986-L1063