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Quartus Backend

Javier Duarte requested to merge github/fork/hamzajaved780/master into master

Created by: hamzajaved780

This PR integrates Quartus backend with the hls4ml frontend (PR #195). Backend can selected by changing the backend config variable to Quartus / Vivado. Several functions have been pushed back to their backend-specific template and writer files. This allows easier integration of new backends by just defining new template and writer files. This solution still isn't perfect and a further restructuring of the front-end is needed for future seamless integrations.

In addition, the following layers are currently supported on the Quartus backend:

  1. Dense Latency / Large with binary/ternary support.
  2. Activations (The same as in Vivado)

There is also partial support for sparse dense layers, however there are some scaling issues with wide networks.

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