fix LeViT_384 train bugs

ppcls/arch/backbone/model_zoo/levit.py

@@ -128,10 +128,10 @@ class Residual(nn.Layer):
 
     def forward(self, x):
         if self.training and self.drop > 0:
-            return paddle.add(x,
-                              self.m(x) * paddle.rand(
-                                  x.size(0), 1, 1, device=x.device).ge_(
-                                      self.drop).div(1 - self.drop).detach())
+            y = paddle.rand(
+                shape=[x.shape[0], 1, 1]).__ge__(self.drop).astype("float32")
+            y = y.divide(paddle.full_like(y, 1 - self.drop))
+            return paddle.add(x, y)
         else:
             return paddle.add(x, self.m(x))
 
@@ -221,8 +221,6 @@ class Subsample(nn.Layer):
 
     def forward(self, x):
         B, N, C = x.shape
-        #x = paddle.reshape(x, [B, self.resolution, self.resolution,
-        #                        C])[:, ::self.stride, ::self.stride]
         x = paddle.reshape(x, [B, self.resolution, self.resolution, C])
         end1, end2 = x.shape[1], x.shape[2]
         x = x[:, 0:end1:self.stride, 0:end2:self.stride]
@@ -428,7 +426,7 @@ class LeViT(nn.Layer):
         x = paddle.transpose(x, perm=[0, 2, 1])
         x = self.blocks(x)
         x = x.mean(1)
-        x = paddle.reshape(x, [-1, 384])
+        x = paddle.reshape(x, [-1, x.shape[-1]])
         if self.distillation:
             x = self.head(x), self.head_dist(x)
             if not self.training: