tensorflow/models · error · ValueError

Unexpected inputs to {self.__class__} with length at {len(in

Error message

Unexpected inputs to {self.__class__} with length at {len(inputs)}.

What it means

Error "Unexpected inputs to {self.__class__} with length at {len(inputs)}." thrown in tensorflow/models.

Source

Thrown at official/nlp/modeling/layers/pack_optimization.py:157

  def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    if self._output_range is not None:
      raise ValueError(f'{self.__class__} does not '
                       'support `output_range` argument.')
    # TODO(b/337888023): Support block sparse attention with strided inputs.
    if self._src_block_size is not None:
      raise ValueError(f'{self.__class__} does not '
                       'support block sparse attention.')

  def call(self, inputs, stride: tf.Tensor):
    if isinstance(inputs, (list, tuple)):
      if len(inputs) == 2:
        input_tensor, attention_mask = inputs
        key_value = None
      elif len(inputs) == 3:
        input_tensor, key_value, attention_mask = inputs
      else:
        raise ValueError(f'Unexpected inputs to {self.__class__} with '
                         f'length at {len(inputs)}.')
    else:
      input_tensor, key_value, attention_mask = (inputs, None, None)

    target_tensor = input_tensor[:, ::stride, :]
    if attention_mask is not None:
      attention_mask = attention_mask[:, ::stride, :]

    if key_value is None:
      key_value = input_tensor

    attention_output = self._attention_layer(
        query=target_tensor, value=key_value, attention_mask=attention_mask)
    attention_output = self._attention_dropout(attention_output)
    attention_output = target_tensor + self._rezero_a * attention_output
    if self._use_layer_norm:
      attention_output = self._attention_layer_norm(attention_output)
    else:

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/nlp/modeling/layers/pack_optimization.py:157 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tensorflow/models@e006f5f0d5 (2026-08-24). Data as JSON: /api/errors/6a0b5c7c4ac1bf9a. Report an issue: GitHub.