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[Streamline] Allow AbsorbSignBiasIntoMultiThreshold to absorb any bias#1173

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[Streamline] Allow AbsorbSignBiasIntoMultiThreshold to absorb any bias
Note: Keep the name indicating only handling signed-bias but adjust thedatatype inference after absorbing the bias to handle signed bias aswell as outputs.
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@iksnagreb
iksnagreb committedAug 28, 2024
commit323cd9f1d0808d0ee80b49dba2f12bbb51d89376
9 changes: 8 additions & 1 deletionsrc/finn/transformation/streamline/absorb.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -80,7 +80,14 @@ def apply(self, model):
steps = T.shape[-1]
new_min = bias
new_max = steps + bias
odt = DataType.get_smallest_possible(steps).name.replace("UINT", "INT")

# Allows the signedness to change depending on the new
# output range [new_min,new_max]
if abs(new_min) > abs(new_max):
odt = DataType.get_smallest_possible(new_min).name
else:
odt = DataType.get_smallest_possible(new_max).name

odt = DataType[odt]
assert odt.allowed(new_max) and odt.allowed(
new_min
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