Read the equation
In get_usable_length, this statement returns the displayed result. The addition or subtraction updates the named state or combines residual contributions. The input shapes and the order in the surrounding forward path must be preserved.
Terms & definitions
The recovered passage does not supply a separate symbol table. Read the source context for the notation used in this version; familiar letters may carry different meanings in other builds.
How it works
Read the displayed expression together with the surrounding source statement; it is retained as an expression rather than silently completed into an equality.
Substitute the source-defined variables or recorded values and follow the displayed arithmetic and indexing exactly.
Use this version’s variable definitions and update order. The same symbol may be assigned a different meaning in another build.
Assumptions & limits
Source recovery establishes that the expression appears in this record. Its mathematical validity, implementation behavior, and interpretation must be assessed separately. See the linked source and research notes for the checks available for this version.
Original context
Read the surrounding source passage
max_length = past_key_value.get_max_cache_shape()
previous_seq_length = past_key_value.get_seq_length(layer_idx)
if max_length is not None and max_length > 0 and previous_seq_length + new_seq_length > max_length:
return max_length - new_seq_length
return previous_seq_lengthExact original notation
return max_length - new_seq_length