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[shortfin] Fix mobilenet_server example by filling mapped storage. #241

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merged 3 commits into from
Oct 3, 2024
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[shortfin] Fix mobilenet_server example by filling mapped storage. #241

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b6d60e0
[shortfin] Fix mobilenet_server example by writing bytes directly.
ScottTodd Oct 1, 2024
1e80528
Use fill instead of indexing byte by byte.
ScottTodd Oct 3, 2024
a3c96fe
Merge branch 'main' into shortfin-example-io
ScottTodd Oct 3, 2024
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4 changes: 3 additions & 1 deletion shortfin/examples/python/mobilenet_server/inference_system.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,9 @@ async def run(self):
# just writing to the backing storage is the best we have API
# support for. Generally, APIs on storage should be mirrored onto
# the array.
self.host_staging.storage.data = request.raw_image_data
# TODO: Easier to use API for writing into the storage
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Grrg. Yeah, these low level transfer methods need an upgrade. Up until the most recent commit, I didn't have the device level metadata I needed to determine the right way to load data on to the device (i.e. map, transfer, chunk, etc). Now that I have that, need to design a more ergonomic API.

With that said, I believe that mapping.fill(buffer) will do what you want if the buffer is the size of the target (i.e. it will copy x1 vs tile). There are some tests that exercise that.

So I think you can say:

with self.host_staging.storage.map(write=True, discard=True) as m:
  m.fill(request.raw_image_data)

(assuming sizes line up)

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Nice, fill works. I saw that API and thought it would only work for a pattern of bytes, based on my read the docs: https://shortfin.readthedocs.io/en/latest/reference.html#shortfin_default.lib.array.storage.fill (also seems like docs are missing for the result of map()... should make sure we have cross reference links between all the types).

with self.host_staging.storage.map(write=True, discard=True) as m:
m.fill(request.raw_image_data)
print("host_staging =", self.host_staging)
self.device_input.copy_from(self.host_staging)

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