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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_tensor_mtf_dimension_names(self, tensor_name):
 """The Mesh TensorFlow dimensions associated with a tensor. Args: tensor_name: a string, name of a tensor in the graph. Returns: a [string], the names of Mesh TensorFlow dimensions. """

    tensor = self._name_to_tensor(tensor_name)
    if isinstance(tensor, mtf.Tensor):
      return tensor.shape.dimension_names
    else:  # tf.Tensor
      return []