fix: fix -1 in dims

ppcls/arch/backbone/model_zoo/pvt_v2.py

@@ -147,7 +147,8 @@ class Attention(nn.Layer):
                 ]).transpose([2, 0, 3, 1, 4])
         else:
             x_ = x.transpose([0, 2, 1]).reshape([B, C, H, W])
-            x_ = self.sr(self.pool(x_)).reshape([B, C, -1]).transpose(
+            x_ = self.sr(self.pool(x_))
+            x_ = x_.reshape([B, C, x_.shape[2] * x_.shape[3]]).transpose(
                 [0, 2, 1])
             x_ = self.norm(x_)
             x_ = self.act(x_)