Return type:
      Tensor
Example:
  >>> qx = torch.quantize_per_tensor(torch.rand(2, 2, 2, 2), 1.5, 3, torch.quint8)
  >>> torch.quantized_max_pool2d(qx, [2,2])
  tensor([[[[1.5000]],

          [[1.5000]]],


          [[[0.0000]],

          [[0.0000]]]], size=(2, 2, 1, 1), dtype=torch.quint8,
      quantization_scheme=torch.per_tensor_affine, scale=1.5, zero_point=3)
