text: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  # Copyright 1999-2018 Alibaba Group Holding Ltd.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from .flip import flip
  
  
  def flipud(m):
      """
      Flip tensor in the up/down direction.
  
      Flip the entries in each column in the up/down direction.
      Rows are preserved, but appear in a different order than before.
  
      Parameters
      ----------
      m : array_like
          Input tensor.
  
      Returns
      -------
      out : array_like
          A view of `m` with the rows reversed.  Since a view is
          returned, this operation is :math:`\\mathcal O(1)`.
  
      See Also
      --------
      fliplr : Flip tensor in the left/right direction.
      rot90 : Rotate tensor counterclockwise.
  
      Notes
      -----
      Equivalent to ``m[::-1,...]``.
      Does not require the tensor to be two-dimensional.
  
      Examples
      --------
      >>> import mars.tensor as mt
  
      >>> A = mt.diag([1.0, 2, 3])
      >>> A.execute()
      array([[ 1.,  0.,  0.],
             [ 0.,  2.,  0.],
             [ 0.,  0.,  3.]])
      >>> mt.flipud(A).execute()
      array([[ 0.,  0.,  3.],
             [ 0.,  2.,  0.],
             [ 1.,  0.,  0.]])
  
      >>> A = mt.random.randn(2,3,5)
      >>> mt.all(mt.flipud(A) == A[::-1,...]).execute()
      True
  
      >>> mt.flipud([1,2]).execute()
      array([2, 1])
  
      """
      return flip(m, 0)
  