tensorflow/models · error · ValueError

Unexpected inputs to %s with length at %d

Error message

Unexpected inputs to %s with length at %d

What it means

Error "Unexpected inputs to %s with length at %d" thrown in tensorflow/models.

Source

Thrown at official/nlp/modeling/layers/pack_optimization.py:88

  def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    if self._output_range is not None:
      raise ValueError('StridedTransformerEncoderBlock 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('StridedTransformerEncoderBlock 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('Unexpected inputs to %s with length at %d' %
                         (self.__class__, len(inputs)))
    else:
      input_tensor, key_value, attention_mask = (inputs, None, None)

    if self._norm_first:
      source_tensor = input_tensor[:, ::stride, :]
      input_tensor = self._attention_layer_norm(input_tensor)
      if key_value is not None:
        key_value = self._attention_layer_norm_kv(key_value)
    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)

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/nlp/modeling/layers/pack_optimization.py:88 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/085ee1647606b4a7. Report an issue: GitHub.