def combine_tensors(self, tensors):
    """Combines `tensors`.

    Args:
      tensors: List of tensors to combine.

    Returns:
      Combined tensor.
    """
Combines `tensors`.

    Args:
      tensors: List of tensors to combine.

    Returns:
      Combined tensor.
    
tensor2tensor/models/neural_architecture_search/nas_model.py