Handle multiple datasets

utils/datasets.py

@@ -280,6 +280,18 @@ class LoadImagesAndLabels(Dataset):  # for training/testing
     def __init__(self, path, img_size=640, batch_size=16, augment=False, hyp=None, rect=False, image_weights=False,
                  cache_images=False, single_cls=False, stride=32, pad=0.0):
         try:
+            if type(path) is list:
+                # Multiple datasets handler
+                f = []
+                for subpath in path:
+                    with open(subpath, 'r') as t:
+                        subpath = str(Path(subpath))  # os-agnostic
+                        parent = str(Path(subpath).parent) + os.sep
+                        t = t.read().splitlines()
+                        t = [x.replace('./', parent) if x.startswith('./') else x for x in t]  # local to global path
+                        f += t
+                path = str(Path(path[0]))  # from now on treat multiple datasets as single
+            else:
                 path = str(Path(path))  # os-agnostic
                 parent = str(Path(path).parent) + os.sep
                 if os.path.isfile(path):  # file