Helpers for CMSSW emulation

[jmitrevs]

Description

These features help in writing CMSSW emulators by providing a standardized way extract the inputs and outputs and call the hls4ml functions. Currently, it is only tested for io_parallel and for the Vitis backend. The emulation mode is requires convert_from_keras_model or more generally convert_from_*_model (though so far only tested with Keras) to have the following parameters set:

  namespace='hls4ml_model_emu_v1',
  write_weights_txt=False,
  write_emulation_constants=True,

Type of change

• New feature (non-breaking change which adds functionality)

Tests

Currently only tested manually. Tests to be added.

Checklist

• I have read the guidelines for contributing.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have installed and run pre-commit on the files I edited or added.
• I have added tests that prove my fix is effective or that my feature works.

[jmitrevs]

Instead of adding the extra type defintion in the defines.h and the extra interface in myproject.h when we have the write_emulation_constants flag set, we can also create a new emulation header. Does that seem better?