|---| | [ View source on GitHub](https://github.com/tensorflow/agents/blob/v0.19.0/tf_agents/specs/tensor_spec.py#L147-L185) | Converts a nest of TensorSpecs to a nest of matching placeholders. tf_agents.specs.tensor_spec.to_nest_placeholder( nested_tensor_specs, default=None, name_scope='', outer_dims=() )


| ## Args || |---|---| | `nested_tensor_specs` | A nest of tensor specs. | | `default` | Optional constant value to set as a default for the placeholder. | | `name_scope` | String name for the scope to create the placeholders in. | | `outer_dims` | Optional leading dimensions for the placeholder. |



| ## Returns || |---|---| | A nest of placeholders matching the given tensor spec. ||



| ## Raises || |---|---| | `ValueError` | If a default is provided outside of the allowed types, or if default is a np.array that does not match the spec shape. |