A variable past_key_value is defined but not used correctly.

[Flanker-ultimate]

In the provided code snippet, a variable past_key_value is defined but not used correctly. The code intends to process the key - value pairs for each layer during the forward pass of the decoder layers. However, when calling the decoder_layer for forward propagation, the entire past_key_values is passed instead of the current layer's past_key_value.

past_key_value = (
    past_key_values[idx]
    if (past_key_values is not None and idx < len(past_key_values))
    else None
)