Merge pull request #1 from iclementine/niuzhibo-develop_fft

Add sample code for ihfft2

python/paddle/tensor/fft.py

@@ -1112,7 +1112,24 @@ def ihfft2(x, s=None, axes=(-2, -1), norm="backward", name=None):
             refer to :ref:`api_guide_Name` . 
 
     Returns:
-        out(Tensor) : The result of the inverse real 2-D FFT.
+        out(Tensor) : The result of the inverse hermitian 2-D FFT.
+
+    Examples:
+
+        .. code-block:: python
+
+            import numpy as np
+            import paddle
+
+            x = np.mgrid[:5, :5][0].astype(np.float64)
+            xp = paddle.to_tensor(x)
+            ihfft2_xp = paddle.fft.ihfft2(xp).numpy()
+            print(ihfft2_xp)
+            # [[ 2. +0.j          0. +0.j          0. +0.j        ]
+            #  [-0.5-0.68819096j  0. +0.j          0. +0.j        ]
+            #  [-0.5-0.16245985j  0. +0.j          0. +0.j        ]
+            #  [-0.5+0.16245985j  0. +0.j          0. +0.j        ]
+            #  [-0.5+0.68819096j  0. +0.j          0. +0.j        ]]
     """
     _check_at_least_ndim(x, 2)
     if s is not None: