diff --git a/models.py b/models.py
index 2bb8719b..562a5c6a 100755
--- a/models.py
+++ b/models.py
@@ -139,7 +139,7 @@ class YOLOLayer(nn.Module):
         if targets is not None:
             MSELoss = nn.MSELoss(size_average=True)
             BCEWithLogitsLoss = nn.BCEWithLogitsLoss(size_average=True)
-            CrossEntropyLoss = nn.CrossEntropyLoss()
+            # CrossEntropyLoss = nn.CrossEntropyLoss()
 
             if requestPrecision:
                 gx = self.grid_x[:, :, :nG, :nG]
@@ -176,7 +176,7 @@ class YOLOLayer(nn.Module):
                 lx, ly, lw, lh, lcls, lconf = FT([0]), FT([0]), FT([0]), FT([0]), FT([0]), FT([0])
 
             # Add confidence loss for background anchors (noobj)
-            #lconf += k * BCEWithLogitsLoss(pred_conf[~mask], mask[~mask].float())
+            # lconf += k * BCEWithLogitsLoss(pred_conf[~mask], mask[~mask].float())
 
             # Sum loss components
             loss = lx + ly + lw + lh + lconf + lcls
@@ -244,8 +244,8 @@ class Darknet(nn.Module):
 
         if is_training:
             self.losses['nT'] /= 3
-            self.losses['TC'] /= 3
-            metrics = torch.zeros(4, len(self.losses['FPe']))  # TP, FP, FN, target_count
+            self.losses['TC'] /= 3  # target category
+            metrics = torch.zeros(3, len(self.losses['FPe']))  # TP, FP, FN
 
             ui = np.unique(self.losses['TC'])[1:]
             for i in ui:
@@ -253,7 +253,6 @@ class Darknet(nn.Module):
                 metrics[0, i] = (self.losses['TP'][j] > 0).sum().float()  # TP
                 metrics[1, i] = (self.losses['FP'][j] > 0).sum().float()  # FP
                 metrics[2, i] = (self.losses['FN'][j] == 3).sum().float()  # FN
-            metrics[3] = metrics.sum(0)
             metrics[1] += self.losses['FPe']
 
             self.losses['TP'] = metrics[0].sum()
diff --git a/train.py b/train.py
index 82a5188e..a605e186 100644
--- a/train.py
+++ b/train.py
@@ -87,6 +87,7 @@ def main(opt):
 
     modelinfo(model)
     t0, t1 = time.time(), time.time()
+    mean_recall, mean_precision = 0, 0
     print('%10s' * 16 % (
         'Epoch', 'Batch', 'x', 'y', 'w', 'h', 'conf', 'cls', 'total', 'P', 'R', 'nTargets', 'TP', 'FP', 'FN', 'time'))
     for epoch in range(opt.epochs):
@@ -112,7 +113,8 @@ def main(opt):
 
         ui = -1
         rloss = defaultdict(float)  # running loss
-        metrics = torch.zeros(4, num_classes)
+        metrics = torch.zeros(3, num_classes)
+        optimizer.zero_grad()
         for i, (imgs, targets) in enumerate(dataloader):
             if sum([len(x) for x in targets]) < 1:  # if no targets continue
                 continue
@@ -125,37 +127,37 @@ def main(opt):
 
             # Compute loss, compute gradient, update parameters
             loss = model(imgs.to(device), targets, requestPrecision=True)
-            optimizer.zero_grad()
             loss.backward()
+
+            # accumulated_batches = 4  # accumulate gradient for 4 batches before stepping optimizer
+            # if ((i+1) % accumulated_batches == 0) or (i == len(dataloader) - 1):
             optimizer.step()
+            optimizer.zero_grad()
 
             # Compute running epoch-means of tracked metrics
             ui += 1
             metrics += model.losses['metrics']
+            TP, FP, FN = metrics
             for key, val in model.losses.items():
                 rloss[key] = (rloss[key] * ui + val) / (ui + 1)
 
             # Precision
-            precision = metrics[0] / (metrics[0] + metrics[1] + 1e-16)
-            k = (metrics[0] + metrics[1]) > 0
+            precision = TP / (TP + FP)
+            k = (TP + FP) > 0
             if k.sum() > 0:
                 mean_precision = precision[k].mean()
-            else:
-                mean_precision = 0
 
             # Recall
-            recall = metrics[0] / (metrics[0] + metrics[2] + 1e-16)
-            k = (metrics[0] + metrics[2]) > 0
+            recall = TP / (TP + FN)
+            k = (TP + FN) > 0
             if k.sum() > 0:
                 mean_recall = recall[k].mean()
-            else:
-                mean_recall = 0
 
             s = ('%10s%10s' + '%10.3g' * 14) % (
                 '%g/%g' % (epoch, opt.epochs - 1), '%g/%g' % (i, len(dataloader) - 1), rloss['x'],
                 rloss['y'], rloss['w'], rloss['h'], rloss['conf'], rloss['cls'],
-                rloss['loss'], mean_precision, mean_recall, model.losses['nT'], model.losses['TP'],
-                model.losses['FP'], model.losses['FN'], time.time() - t1)
+                rloss['loss'], mean_precision, mean_recall, model.losses['nT'], TP.sum(),
+                FP.sum(), FN.sum(), time.time() - t1)
             t1 = time.time()
             print(s)
 
diff --git a/utils/gcp.sh b/utils/gcp.sh
index 42d5ee7c..e21e5155 100644
--- a/utils/gcp.sh
+++ b/utils/gcp.sh
@@ -11,21 +11,22 @@ gsutil cp gs://ultralytics/fresh9_5_e201.pt yolov3/checkpoints
 python3 detect.py
 
 # Test
-python3 test.py -img_size 416 -weights_path checkpoints/latest.pt -conf_thresh 0.5
+python3 test.py -img_size 416 -weights_path checkpoints/latest.pt -conf_thres 0.5
 
 # Download and Test
 sudo rm -rf yolov3 && git clone https://github.com/ultralytics/yolov3
-cd yolov3
-cd checkpoints
+cd yolov3/checkpoints
 wget https://pjreddie.com/media/files/yolov3.weights
 cd ..
 python3 test.py -img_size 416 -weights_path checkpoints/backup5.pt -nms_thres 0.45
 
 # Download and Resume
 sudo rm -rf yolov3 && git clone https://github.com/ultralytics/yolov3
-cd yolov3
-cd checkpoints
+cd yolov3/checkpoints
 wget https://storage.googleapis.com/ultralytics/yolov3.pt
 cp yolov3.pt latest.pt
 cd ..
-python3 train.py -img_size 416 -epochs 1 -resume 1
+python3 train.py -img_size 416 -batch_size 12 -epochs 1 -resume 1
+python3 test.py -img_size 416 -weights_path checkpoints/latest.pt -conf_thres 0.5
+
+