classmethod from_dict(dtype_config_dict)
  Create a "DTypeConfig" from a dictionary with the following
  items (all optional):
     "input_dtype": torch.dtype or "DTypeWithConstraints"
     "output_dtype": torch.dtype or "DTypeWithConstraints"
     "weight_dtype": torch.dtype or "DTypeWithConstraints"
     "bias_type": torch.dtype "is_dynamic": bool

  Return type:
     *DTypeConfig*

to_dict()
  Convert this "DTypeConfig" to a dictionary with the items
  described in "from_dict()".

  Return type:
     *Dict*[str, *Any*]
