fix bifpn comments

Author: zylo117

efficientdet/model.py

@@ -204,13 +204,13 @@ def _forward_fast_attention(self, inputs):
         # Weights for P5_0 and P6_1 to P5_1
         p5_w1 = self.p5_w1_relu(self.p5_w1)
         weight = p5_w1 / (torch.sum(p5_w1, dim=0) + self.epsilon)
-        # Connections for P5_0 and P6_0 to P5_1 respectively
+        # Connections for P5_0 and P6_1 to P5_1 respectively
         p5_up = self.conv5_up(self.swish(weight[0] * p5_in + weight[1] * self.p5_upsample(p6_up)))
 
         # Weights for P4_0 and P5_1 to P4_1
         p4_w1 = self.p4_w1_relu(self.p4_w1)
         weight = p4_w1 / (torch.sum(p4_w1, dim=0) + self.epsilon)
-        # Connections for P4_0 and P5_0 to P4_1 respectively
+        # Connections for P4_0 and P5_1 to P4_1 respectively
         p4_up = self.conv4_up(self.swish(weight[0] * p4_in + weight[1] * self.p4_upsample(p5_up)))
 
         # Weights for P3_0 and P4_1 to P3_2