tensorflow/models · error · ValueError

Expected first spec to be StemSpec, got {}

Error message

Expected first spec to be StemSpec, got {}

What it means

Error "Expected first spec to be StemSpec, got {}" thrown in tensorflow/models.

Source

Thrown at official/projects/movinet/modeling/movinet.py:401

    self._input_specs = input_specs
    self._use_sync_bn = use_sync_bn
    self._activation = activation
    self._gating_activation = gating_activation
    self._norm_momentum = norm_momentum
    self._norm_epsilon = norm_epsilon
    self._norm = tf_keras.layers.BatchNormalization
    self._kernel_initializer = kernel_initializer
    self._kernel_regularizer = kernel_regularizer
    self._bias_regularizer = bias_regularizer
    self._stochastic_depth_drop_rate = stochastic_depth_drop_rate
    self._use_external_states = use_external_states
    self._output_states = output_states
    self._average_pooling_type = average_pooling_type

    if self._use_external_states and not self._causal:
      raise ValueError('External states should be used with causal mode.')
    if not isinstance(block_specs[0], StemSpec):
      raise ValueError(
          'Expected first spec to be StemSpec, got {}'.format(block_specs[0]))
    if not isinstance(block_specs[-1], HeadSpec):
      raise ValueError(
          'Expected final spec to be HeadSpec, got {}'.format(block_specs[-1]))
    self._head_filters = block_specs[-1].head_filters

    state_specs = None
    if use_external_states:
      self._set_dtype_policy(input_specs.dtype)
      state_specs = self.initial_state_specs(input_specs.shape)

    inputs, outputs = self._build_network(input_specs, state_specs=state_specs)

    super(Movinet, self).__init__(inputs=inputs, outputs=outputs, **kwargs)

    self._state_specs = state_specs

  def _build_network(

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/projects/movinet/modeling/movinet.py:401 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/c693f90453f5f2d5. Report an issue: GitHub.