How to use axi stream interface on non-PYNQ boards

[adhowe3]

I am following the tutorial to get started with HLS4ML part1_getting_started, and successfully generated the IP.

I am now trying to get it running but for a different board (VCK190, part: xcvc1902-vsva2197-2MP-e-S ). At this point I would like for the IP to use an axi stream interface instead of the ap_vld interface.

I can't seem to find any documentation on how to change the interface except for the few PYNQ boards (using the VivadoAccelerator). So maybe it is not possible, and I will have to modify the generated HLS myself. Any help or pointing in the right direction would be appreciated!

[bo3z]

You can change the io_type when converting the model to io_stream. This is explained in the CNN tutorial, part 6.

[adhowe3]

Great thank you for pointing that out!

For anyone wondering what the solution is, when converting your model you need to add the io_type argument and set it to io_stream:

hls_model = hls4ml.converters.convert_from_keras_model(
    model, 
    hls_config=config, backend='Vitis', 
    output_dir='model_1/hls4ml_prj', 
    part='xcvc1902-vsva2197-2MP-e-S', 
    io_type='io_stream'
)

[bo3z]

Perfect, thanks for confirming. Closing this discussion then!