W&B logging add hyperparameters (#1399)

* W&B logging add hyperparameters

* hyp bug fix and image logging updates

* if plots and wandb:

* cleanup

* wandb/ gitignore add

* cleanup 2

* cleanup 3

* move wandb import to top of file

* wandb evolve

* update import

* wandb.run.finish()

* default anchors: 3

utils/plots.py

@@ -158,13 +158,13 @@ def plot_images(images, targets, paths=None, fname='images.jpg', names=None, max
                 cls = int(classes[j])
                 color = colors[cls % len(colors)]
                 cls = names[cls] if names else cls
-                if labels or conf[j] > 0.3:  # 0.3 conf thresh
+                if labels or conf[j] > 0.25:  # 0.25 conf thresh
                     label = '%s' % cls if labels else '%s %.1f' % (cls, conf[j])
                     plot_one_box(box, mosaic, label=label, color=color, line_thickness=tl)
 
         # Draw image filename labels
-        if paths is not None:
-            label = os.path.basename(paths[i])[:40]  # trim to 40 char
+        if paths:
+            label = Path(paths[i]).name[:40]  # trim to 40 char
             t_size = cv2.getTextSize(label, 0, fontScale=tl / 3, thickness=tf)[0]
             cv2.putText(mosaic, label, (block_x + 5, block_y + t_size[1] + 5), 0, tl / 3, [220, 220, 220], thickness=tf,
                         lineType=cv2.LINE_AA)
@@ -172,7 +172,7 @@ def plot_images(images, targets, paths=None, fname='images.jpg', names=None, max
         # Image border
         cv2.rectangle(mosaic, (block_x, block_y), (block_x + w, block_y + h), (255, 255, 255), thickness=3)
 
-    if fname is not None:
+    if fname:
         r = min(1280. / max(h, w) / ns, 1.0)  # ratio to limit image size
         mosaic = cv2.resize(mosaic, (int(ns * w * r), int(ns * h * r)), interpolation=cv2.INTER_AREA)
         # cv2.imwrite(fname, cv2.cvtColor(mosaic, cv2.COLOR_BGR2RGB))  # cv2 save