The TFLM code_generator takes a TFLite model and generates C/C++ source code that can then be compiled into a binary. This change adds a Bazel macro for invoking the code generator and creating a cc_library with the resulting sources. It also updates the checked-in hello_world example with an appropriate BUILD file and updates the script to use Bazel instead of make.
BUG=b/294230402
The TFLM kernels use the MicroContext and MicroGraph interfaces to fetch
eval tensors and access other parts of the graph. Since codegen does not
have the MicroInterpreter and related objects to serve those, this PR
introduces a new MicroCodegenContext class that serves as both the
MicroContext and MicroGraph.
The MicroCodegenContext is configured with a span of Subgraphs, each of
which includes the inputs, outputs, nodes, tensors and an invocation
function. The code generator will create the data and functions needed
for each Subgraph and initialize the MicroCodegenContext with it. By
having the re-usable MicroCodegenContext, the code generator won't have
to generate nearly as much code.
BUG=b/295174086
RJ Ascani