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Fix potential off-by-one error in attention mask generation #76

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Fix potential off-by-one error in attention mask generation #76

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2 changes: 1 addition & 1 deletion octo/model/components/block_transformer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -290,7 +290,7 @@ def generate_attention_mask(
self.verify_causality(prefix_groups, timestep_groups)

def _get_position(i, tokens_per_elem):
return np.searchsorted(np.cumsum(tokens_per_elem), i)
return np.searchsorted(np.cumsum(tokens_per_elem), i, side='right')

horizon = timestep_groups[0].tokens.shape[1]
tokens_per_prefix_group = [group.tokens.shape[1] for group in prefix_groups]
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