fix resnest (#491)

ppcls/modeling/architectures/resnest.py

@@ -165,14 +165,15 @@ class SplatConv(nn.Layer):
 
         atten = self.conv3(gap)
         atten = self.rsoftmax(atten)
-        atten = paddle.reshape(x=atten, shape=[-1, atten.shape[1], 1, 1])
 
         if self.radix > 1:
             attens = paddle.split(atten, num_or_sections=self.radix, axis=1)
-            y = paddle.add_n(
-                [split * att for (att, split) in zip(attens, splited)])
+            y = paddle.add_n([
+                paddle.multiply(split, att)
+                for (att, split) in zip(attens, splited)
+            ])
         else:
-            y = x * atten
+            y = paddle.multiply(x, atten)
 
         return y