[bug fix] fix spectral_norm bug

python/paddle/fluid/dygraph/nn.py

@@ -3062,6 +3062,12 @@ def __init__(self,
         self._dtype = dtype
 
         self._weight_shape = list(weight_shape)
+        assert np.prod(self._weight_shape) > 0,\
+            "Any dimension of `weight_shape` cannot be equal to 0."
+        assert dim < len(self._weight_shape), \
+            ("The input `dim` should be less than the "
+            "length of `weight_shape`, but received dim="
+            "{}".format(dim))
         h = self._weight_shape[self._dim]
         w = np.prod(self._weight_shape) // h
 

python/paddle/fluid/layers/nn.py

@@ -3720,6 +3720,10 @@ def spectral_norm(weight, dim=0, power_iters=1, eps=1e-12, name=None):
     # create intput and parameters
     inputs = {'Weight': weight}
     input_shape = weight.shape
+    assert weight.numel() > 0, "Any dimension of input cannot be equal to 0."
+    assert dim < len(input_shape), ("The input `dim` should be less than the "
+                                    "rank of `weight`, but received dim="
+                                    "{}".format(dim))
     h = input_shape[dim]
     w = np.prod(input_shape) // h