PyTorch Hub and autoShape update (ultralytics#1415)

* PyTorch Hub and autoShape update

* comment x for imgs

* reduce comment

detect.py

@@ -89,7 +89,7 @@ def detect(save_img=False):
             txt_path = str(save_dir / 'labels' / p.stem) + ('_%g' % dataset.frame if dataset.mode == 'video' else '')
             s += '%gx%g ' % img.shape[2:]  # print string
             gn = torch.tensor(im0.shape)[[1, 0, 1, 0]]  # normalization gain whwh
-            if det is not None and len(det):
+            if len(det):
                 # Rescale boxes from img_size to im0 size
                 det[:, :4] = scale_coords(img.shape[2:], det[:, :4], im0.shape).round()
 

hubconf.py

@@ -5,15 +5,16 @@
     model = torch.hub.load('ultralytics/yolov5', 'yolov5s', pretrained=True, channels=3, classes=80)
 """
 
-dependencies = ['torch', 'yaml']
 from pathlib import Path
 
 import torch
+from PIL import Image
 
 from models.yolo import Model
 from utils.general import set_logging
 from utils.google_utils import attempt_download
 
+dependencies = ['torch', 'yaml', 'pillow']
 set_logging()
 
 
@@ -41,7 +42,7 @@ def create(name, pretrained, channels, classes):
             model.load_state_dict(state_dict, strict=False)  # load
             if len(ckpt['model'].names) == classes:
                 model.names = ckpt['model'].names  # set class names attribute
-            # model = model.autoshape()  # for autoshaping of PIL/cv2/np inputs and NMS
+            # model = model.autoshape()  # for PIL/cv2/np inputs and NMS
         return model
 
     except Exception as e:
@@ -108,11 +109,10 @@ def yolov5x(pretrained=False, channels=3, classes=80):
 
 if __name__ == '__main__':
     model = create(name='yolov5s', pretrained=True, channels=3, classes=80)  # example
-    model = model.fuse().eval().autoshape()  # for autoshaping of PIL/cv2/np inputs and NMS
+    model = model.fuse().autoshape()  # for PIL/cv2/np inputs and NMS
 
     # Verify inference
-    from PIL import Image
-
-    img = Image.open('data/images/zidane.jpg')
-    y = model(img)
-    print(y[0].shape)
+    imgs = [Image.open(x) for x in Path('data/images').glob('*.jpg')]
+    results = model(imgs)
+    results.show()
+    results.print()

models/common.py

@@ -5,9 +5,11 @@
 import numpy as np
 import torch
 import torch.nn as nn
+from PIL import Image, ImageDraw
 
 from utils.datasets import letterbox
-from utils.general import non_max_suppression, make_divisible, scale_coords
+from utils.general import non_max_suppression, make_divisible, scale_coords, xyxy2xywh
+from utils.plots import color_list
 
 
 def autopad(k, p=None):  # kernel, padding
@@ -125,47 +127,94 @@ class autoShape(nn.Module):
 
     def __init__(self, model):
         super(autoShape, self).__init__()
-        self.model = model
+        self.model = model.eval()
 
-    def forward(self, x, size=640, augment=False, profile=False):
+    def forward(self, imgs, size=640, augment=False, profile=False):
         # supports inference from various sources. For height=720, width=1280, RGB images example inputs are:
-        #   opencv:     x = cv2.imread('image.jpg')[:,:,::-1]  # HWC BGR to RGB x(720,1280,3)
-        #   PIL:        x = Image.open('image.jpg')  # HWC x(720,1280,3)
-        #   numpy:      x = np.zeros((720,1280,3))  # HWC
-        #   torch:      x = torch.zeros(16,3,720,1280)  # BCHW
-        #   multiple:   x = [Image.open('image1.jpg'), Image.open('image2.jpg'), ...]  # list of images
+        #   opencv:     imgs = cv2.imread('image.jpg')[:,:,::-1]  # HWC BGR to RGB x(720,1280,3)
+        #   PIL:        imgs = Image.open('image.jpg')  # HWC x(720,1280,3)
+        #   numpy:      imgs = np.zeros((720,1280,3))  # HWC
+        #   torch:      imgs = torch.zeros(16,3,720,1280)  # BCHW
+        #   multiple:   imgs = [Image.open('image1.jpg'), Image.open('image2.jpg'), ...]  # list of images
 
         p = next(self.model.parameters())  # for device and type
-        if isinstance(x, torch.Tensor):  # torch
-            return self.model(x.to(p.device).type_as(p), augment, profile)  # inference
+        if isinstance(imgs, torch.Tensor):  # torch
+            return self.model(imgs.to(p.device).type_as(p), augment, profile)  # inference
 
         # Pre-process
-        if not isinstance(x, list):
-            x = [x]
+        if not isinstance(imgs, list):
+            imgs = [imgs]
         shape0, shape1 = [], []  # image and inference shapes
-        batch = range(len(x))  # batch size
+        batch = range(len(imgs))  # batch size
         for i in batch:
-            x[i] = np.array(x[i])  # to numpy
-            x[i] = x[i][:, :, :3] if x[i].ndim == 3 else np.tile(x[i][:, :, None], 3)  # enforce 3ch input
-            s = x[i].shape[:2]  # HWC
+            imgs[i] = np.array(imgs[i])  # to numpy
+            imgs[i] = imgs[i][:, :, :3] if imgs[i].ndim == 3 else np.tile(imgs[i][:, :, None], 3)  # enforce 3ch input
+            s = imgs[i].shape[:2]  # HWC
             shape0.append(s)  # image shape
             g = (size / max(s))  # gain
             shape1.append([y * g for y in s])
         shape1 = [make_divisible(x, int(self.stride.max())) for x in np.stack(shape1, 0).max(0)]  # inference shape
-        x = [letterbox(x[i], new_shape=shape1, auto=False)[0] for i in batch]  # pad
+        x = [letterbox(imgs[i], new_shape=shape1, auto=False)[0] for i in batch]  # pad
         x = np.stack(x, 0) if batch[-1] else x[0][None]  # stack
         x = np.ascontiguousarray(x.transpose((0, 3, 1, 2)))  # BHWC to BCHW
         x = torch.from_numpy(x).to(p.device).type_as(p) / 255.  # uint8 to fp16/32
 
         # Inference
-        x = self.model(x, augment, profile)  # forward
-        x = non_max_suppression(x[0], conf_thres=self.conf, iou_thres=self.iou, classes=self.classes)  # NMS
+        with torch.no_grad():
+            y = self.model(x, augment, profile)[0]  # forward
+        y = non_max_suppression(y, conf_thres=self.conf, iou_thres=self.iou, classes=self.classes)  # NMS
 
         # Post-process
         for i in batch:
-            if x[i] is not None:
-                x[i][:, :4] = scale_coords(shape1, x[i][:, :4], shape0[i])
-        return x
+            if y[i] is not None:
+                y[i][:, :4] = scale_coords(shape1, y[i][:, :4], shape0[i])
+
+        return Detections(imgs, y, self.names)
+
+
+class Detections:
+    # detections class for YOLOv5 inference results
+    def __init__(self, imgs, pred, names=None):
+        super(Detections, self).__init__()
+        self.imgs = imgs  # list of images as numpy arrays
+        self.pred = pred  # list of tensors pred[0] = (xyxy, conf, cls)
+        self.names = names  # class names
+        self.xyxy = pred  # xyxy pixels
+        self.xywh = [xyxy2xywh(x) for x in pred]  # xywh pixels
+        gn = [torch.Tensor([*[im.shape[i] for i in [1, 0, 1, 0]], 1., 1.]) for im in imgs]  # normalization gains
+        self.xyxyn = [x / g for x, g in zip(self.xyxy, gn)]  # xyxy normalized
+        self.xywhn = [x / g for x, g in zip(self.xywh, gn)]  # xywh normalized
+
+    def display(self, pprint=False, show=False, save=False):
+        colors = color_list()
+        for i, (img, pred) in enumerate(zip(self.imgs, self.pred)):
+            str = f'Image {i + 1}/{len(self.pred)}: {img.shape[0]}x{img.shape[1]} '
+            if pred is not None:
+                for c in pred[:, -1].unique():
+                    n = (pred[:, -1] == c).sum()  # detections per class
+                    str += f'{n} {self.names[int(c)]}s, '  # add to string
+                if show or save:
+                    img = Image.fromarray(img.astype(np.uint8)) if isinstance(img, np.ndarray) else img  # from np
+                    for *box, conf, cls in pred:  # xyxy, confidence, class
+                        # str += '%s %.2f, ' % (names[int(cls)], conf)  # label
+                        ImageDraw.Draw(img).rectangle(box, width=4, outline=colors[int(cls) % 10])  # plot
+            if save:
+                f = f'results{i}.jpg'
+                str += f"saved to '{f}'"
+                img.save(f)  # save
+            if show:
+                img.show(f'Image {i}')  # show
+            if pprint:
+                print(str)
+
+    def print(self):
+        self.display(pprint=True)  # print results
+
+    def show(self):
+        self.display(show=True)  # show results
+
+    def save(self):
+        self.display(save=True)  # save results
 
 
 class Flatten(nn.Module):

test.py

@@ -126,7 +126,7 @@ def test(data,
             tcls = labels[:, 0].tolist() if nl else []  # target class
             seen += 1
 
-            if pred is None:
+            if len(pred) == 0:
                 if nl:
                     stats.append((torch.zeros(0, niou, dtype=torch.bool), torch.Tensor(), torch.Tensor(), tcls))
                 continue

utils/general.py

@@ -142,7 +142,7 @@ def coco80_to_coco91_class():  # converts 80-index (val2014) to 91-index (paper)
 
 def xyxy2xywh(x):
     # Convert nx4 boxes from [x1, y1, x2, y2] to [x, y, w, h] where xy1=top-left, xy2=bottom-right
-    y = torch.zeros_like(x) if isinstance(x, torch.Tensor) else np.zeros_like(x)
+    y = x.clone() if isinstance(x, torch.Tensor) else np.copy(x)
     y[:, 0] = (x[:, 0] + x[:, 2]) / 2  # x center
     y[:, 1] = (x[:, 1] + x[:, 3]) / 2  # y center
     y[:, 2] = x[:, 2] - x[:, 0]  # width
@@ -152,7 +152,7 @@ def xyxy2xywh(x):
 
 def xywh2xyxy(x):
     # Convert nx4 boxes from [x, y, w, h] to [x1, y1, x2, y2] where xy1=top-left, xy2=bottom-right
-    y = torch.zeros_like(x) if isinstance(x, torch.Tensor) else np.zeros_like(x)
+    y = x.clone() if isinstance(x, torch.Tensor) else np.copy(x)
     y[:, 0] = x[:, 0] - x[:, 2] / 2  # top left x
     y[:, 1] = x[:, 1] - x[:, 3] / 2  # top left y
     y[:, 2] = x[:, 0] + x[:, 2] / 2  # bottom right x
@@ -280,7 +280,7 @@ def non_max_suppression(prediction, conf_thres=0.1, iou_thres=0.6, merge=False,
     multi_label = nc > 1  # multiple labels per box (adds 0.5ms/img)
 
     t = time.time()
-    output = [None] * prediction.shape[0]
+    output = [torch.zeros(0, 6)] * prediction.shape[0]
     for xi, x in enumerate(prediction):  # image index, image inference
         # Apply constraints
         # x[((x[..., 2:4] < min_wh) | (x[..., 2:4] > max_wh)).any(1), 4] = 0  # width-height