From 26b115c306d31563b66333ad1f6253e5ec5f687c Mon Sep 17 00:00:00 2001
From: Glenn Jocher <glenn.jocher@ultralytics.com>
Date: Tue, 9 Apr 2019 12:24:01 +0200
Subject: [PATCH] updates

---
 test.py        |  4 ++++
 train.py       | 14 ++++----------
 utils/utils.py | 15 +++++++++++++++
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/test.py b/test.py
index 30c6f152..98a53e34 100644
--- a/test.py
+++ b/test.py
@@ -61,6 +61,10 @@ def test(
         targets = targets.to(device)
         imgs = imgs.to(device)
 
+        # Plot images with bounding boxes
+        if batch_i == 0 and not os.path.exists('test_batch0.jpg'):
+            plot_images(imgs=imgs, targets=targets, fname='test_batch0.jpg')
+
         # Run model
         inf_out, train_out = model(imgs)  # inference and training outputs
 
diff --git a/train.py b/train.py
index 50b418cf..58792870 100644
--- a/train.py
+++ b/train.py
@@ -104,6 +104,8 @@ def train(
     model_info(model)
     nB = len(dataloader)
     n_burnin = min(round(nB / 5 + 1), 1000)  # burn-in batches
+    os.remove('train_batch0.jpg') if os.path.exists('train_batch0.jpg') else None
+    os.remove('test_batch0.jpg') if os.path.exists('test_batch0.jpg') else None
     for epoch in range(start_epoch, epochs):
         model.train()
         print(('\n%8s%12s' + '%10s' * 7) % ('Epoch', 'Batch', 'xy', 'wh', 'conf', 'cls', 'total', 'nTargets', 'time'))
@@ -127,16 +129,8 @@ def train(
                 continue
 
             # Plot images with bounding boxes
-            plot_images = False
-            if plot_images:
-                fig = plt.figure(figsize=(10, 10))
-                for ip in range(len(imgs)):
-                    boxes = xywh2xyxy(targets[targets[:, 0] == ip, 2:6]).numpy().T * img_size
-                    plt.subplot(4, 4, ip + 1).imshow(imgs[ip].numpy().transpose(1, 2, 0))
-                    plt.plot(boxes[[0, 2, 2, 0, 0]], boxes[[1, 1, 3, 3, 1]], '.-')
-                    plt.axis('off')
-                fig.tight_layout()
-                fig.savefig('batch_%g.jpg' % i, dpi=fig.dpi)
+            if epoch == 0 and i == 0:
+                plot_images(imgs=imgs, targets=targets, fname='train_batch0.jpg')
 
             # SGD burn-in
             if epoch == 0 and i <= n_burnin:
diff --git a/utils/utils.py b/utils/utils.py
index 7b7e5108..b55680a2 100755
--- a/utils/utils.py
+++ b/utils/utils.py
@@ -487,6 +487,21 @@ def plot_wh_methods():  # from utils.utils import *; plot_wh_methods()
     fig.savefig('comparison.jpg', dpi=fig.dpi)
 
 
+def plot_images(imgs, targets, fname='images.jpg'):
+    fig = plt.figure(figsize=(10, 10))
+    img_size = imgs.shape[3]
+    bs = imgs.shape[0]  # batch size
+    sp = np.ceil(bs ** 0.5)  # subplots
+
+    for i in range(bs):
+        boxes = xywh2xyxy(targets[targets[:, 0] == i, 2:6]).numpy().T * img_size
+        plt.subplot(sp, sp, i + 1).imshow(imgs[i].numpy().transpose(1, 2, 0))
+        plt.plot(boxes[[0, 2, 2, 0, 0]], boxes[[1, 1, 3, 3, 1]], '.-')
+        plt.axis('off')
+    fig.tight_layout()
+    fig.savefig(fname, dpi=fig.dpi)
+
+
 def plot_results(start=0, stop=0):  # from utils.utils import *; plot_results()
     # Plot training results files 'results*.txt'
     # import os; os.system('wget https://storage.googleapis.com/ultralytics/yolov3/results_v3.txt')