TypeError: expected Tensor as element 0 in argument 0, but got tuple

hey I want to run the online demo in windows. So, i tried the code as mentioned in #114 @dragen1860 with change mentioned by @gd2016229035 MY CODE (main.py):

import numpy as np
import os
from typing import Tuple
import io
import time
import cv2
import torch
import torchvision
import torch.onnx
from PIL import Image, ImageOps
import onnx
from mobilenet_v2_tsm import MobileNetV2

SOFTMAX_THRES = 0
HISTORY_LOGIT = True
REFINE_OUTPUT = True





def transform(frame: np.ndarray):
    # 480, 640, 3, 0 ~ 255
    frame = cv2.resize(frame, (224, 224))  # (224, 224, 3) 0 ~ 255
    frame = frame / 255.0  # (224, 224, 3) 0 ~ 1.0
    frame = np.transpose(frame, axes=[2, 0, 1])  # (3, 224, 224) 0 ~ 1.0
    frame = np.expand_dims(frame, axis=0)  # (1, 3, 480, 640) 0 ~ 1.0
    return frame


class GroupScale(object):
    """ Rescales the input PIL.Image to the given 'size'.
    'size' will be the size of the smaller edge.
    For example, if height > width, then image will be
    rescaled to (size * height / width, size)
    size: size of the smaller edge
    interpolation: Default: PIL.Image.BILINEAR
    """

    def __init__(self, size, interpolation=Image.BILINEAR):
        self.worker = torchvision.transforms.Scale(size, interpolation)

    def __call__(self, img_group):
        return [self.worker(img) for img in img_group]


class GroupCenterCrop(object):
    def __init__(self, size):
        self.worker = torchvision.transforms.CenterCrop(size)

    def __call__(self, img_group):
        return [self.worker(img) for img in img_group]


class Stack(object):

    def __init__(self, roll=False):
        self.roll = roll

    def __call__(self, img_group):
        if img_group[0].mode == 'L':
            return np.concatenate([np.expand_dims(x, 2) for x in img_group], axis=2)
        elif img_group[0].mode == 'RGB':
            if self.roll:
                return np.concatenate([np.array(x)[:, :, ::-1] for x in img_group], axis=2)
            else:
                return np.concatenate(img_group, axis=2)


class ToTorchFormatTensor(object):
    """ Converts a PIL.Image (RGB) or numpy.ndarray (H x W x C) in the range [0, 255]
    to a torch.FloatTensor of shape (C x H x W) in the range [0.0, 1.0] """

    def __init__(self, div=True):
        self.div = div

    def __call__(self, pic):
        if isinstance(pic, np.ndarray):
            # handle numpy array
            img = torch.from_numpy(pic).permute(2, 0, 1).contiguous()
        else:
            # handle PIL Image
            img = torch.ByteTensor(torch.ByteStorage.from_buffer(pic.tobytes()))
            img = img.view(pic.size[1], pic.size[0], len(pic.mode))
            # put it from HWC to CHW format
            # yikes, this transpose takes 80% of the loading time/CPU
            img = img.transpose(0, 1).transpose(0, 2).contiguous()
        return img.float().div(255) if self.div else img.float()


class GroupNormalize(object):
    def __init__(self, mean, std):
        self.mean = mean
        self.std = std

    def __call__(self, tensor):
        rep_mean = self.mean * (tensor.size()[0] // len(self.mean))
        rep_std = self.std * (tensor.size()[0] // len(self.std))

        # TODO: make efficient
        for t, m, s in zip(tensor, rep_mean, rep_std):
            t.sub_(m).div_(s)

        return tensor


def get_transform():
    cropping = torchvision.transforms.Compose([
        GroupScale(256),
        GroupCenterCrop(224),
    ])
    transform = torchvision.transforms.Compose([
        cropping,
        Stack(roll=False),
        ToTorchFormatTensor(div=True),
        GroupNormalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
    ])
    return transform


catigories = [
    "Doing other things",  # 0
    "Drumming Fingers",  # 1
    "No gesture",  # 2
    "Pulling Hand In",  # 3
    "Pulling Two Fingers In",  # 4
    "Pushing Hand Away",  # 5
    "Pushing Two Fingers Away",  # 6
    "Rolling Hand Backward",  # 7
    "Rolling Hand Forward",  # 8
    "Shaking Hand",  # 9
    "Sliding Two Fingers Down",  # 10
    "Sliding Two Fingers Left",  # 11
    "Sliding Two Fingers Right",  # 12
    "Sliding Two Fingers Up",  # 13
    "Stop Sign",  # 14
    "Swiping Down",  # 15
    "Swiping Left",  # 16
    "Swiping Right",  # 17
    "Swiping Up",  # 18
    "Thumb Down",  # 19
    "Thumb Up",  # 20
    "Turning Hand Clockwise",  # 21
    "Turning Hand Counterclockwise",  # 22
    "Zooming In With Full Hand",  # 23
    "Zooming In With Two Fingers",  # 24
    "Zooming Out With Full Hand",  # 25
    "Zooming Out With Two Fingers"  # 26
]

n_still_frame = 0


def process_output(idx_, history):
    # idx_: the output of current frame
    # history: a list containing the history of predictions
    if not REFINE_OUTPUT:
        return idx_, history

    max_hist_len = 20  # max history buffer

    # mask out illegal action
    if idx_ in [7, 8, 21, 22, 3]:
        idx_ = history[-1]

    # use only single no action class
    if idx_ == 0:
        idx_ = 2

    # history smoothing
    if idx_ != history[-1]:
        if not (history[-1] == history[-2]):  # and history[-2] == history[-3]):
            idx_ = history[-1]

    history.append(idx_)
    history = history[-max_hist_len:]

    return history[-1], history


WINDOW_NAME = 'Video Gesture Recognition'



def get_executor(use_gpu=True):
    torch_module = MobileNetV2(n_class=27)
    if not os.path.exists("mobilenetv2_jester_online.pth.tar"):  # checkpoint not downloaded
        print('Downloading PyTorch checkpoint...')
        import urllib.request
        url = 'https://file.lzhu.me/projects/tsm/models/mobilenetv2_jester_online.pth.tar'
        urllib.request.urlretrieve(url, './mobilenetv2_jester_online.pth.tar')
    torch_module.load_state_dict(torch.load("mobilenetv2_jester_online.pth.tar"))
    torch_inputs = (#torch.rand(1, 3, 224, 224),
                    torch.zeros([1, 3, 56, 56]),
                    torch.zeros([1, 4, 28, 28]),
                    torch.zeros([1, 4, 28, 28]),
                    torch.zeros([1, 8, 14, 14]),
                    torch.zeros([1, 8, 14, 14]),
                    torch.zeros([1, 8, 14, 14]),
                    torch.zeros([1, 12, 14, 14]),
                    torch.zeros([1, 12, 14, 14]),
                    torch.zeros([1, 20, 7, 7]),
                    torch.zeros([1, 20, 7, 7]))

    return torch_module, torch_inputs

def main():
    print("Open camera...")
    cap = cv2.VideoCapture("http://192.168.0.9:5000/video_feed")

    # set a lower resolution for speed up
    # cap.set(cv2.CAP_PROP_FRAME_WIDTH, 320)
    # cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 240)

    # env variables
    full_screen = False
    cv2.namedWindow(WINDOW_NAME, cv2.WINDOW_NORMAL)
    cv2.resizeWindow(WINDOW_NAME, 640, 480)
    cv2.moveWindow(WINDOW_NAME, 0, 0)
    cv2.setWindowTitle(WINDOW_NAME, WINDOW_NAME)

    t = None
    index = 0
    transform = get_transform()
    model, buffer = get_executor()
    model.eval()
    idx = 0
    history = [2]
    history_logit = []
    history_timing = []

    i_frame = -1

    print("Ready!")
    with torch.no_grad():
        while True:
            i_frame += 1
            _, img = cap.read()  # (480, 640, 3) 0 ~ 255
            if i_frame % 2 == 0:  # skip every other frame to obtain a suitable frame rate
                t1 = time.time()

                img_tran = transform([Image.fromarray(img).convert('RGB')])
                input_var = img_tran.view(1, 3, img_tran.size(1), img_tran.size(2))
                
                outputs = model(input_var, buffer)
                feat, buffer = outputs[0], outputs[1]
                feat = feat.detach()
                print(len(buffer), input_var.shape)

                if SOFTMAX_THRES > 0:
                    feat_np = feat.asnumpy().reshape(-1)
                    feat_np -= feat_np.max()
                    softmax = np.exp(feat_np) / np.sum(np.exp(feat_np))

                    print(max(softmax))
                    if max(softmax) > SOFTMAX_THRES:
                        idx_ = np.argmax(feat.asnumpy(), axis=1)[0]
                    else:
                        idx_ = idx
                else:
                    idx_ = np.argmax(feat.cpu().numpy(), axis=1)[0]
                    print(idx_)

                if HISTORY_LOGIT:
                    history_logit.append(feat.cpu().numpy())
                    history_logit = history_logit[-12:]
                    avg_logit = sum(history_logit)
                    idx_ = np.argmax(avg_logit, axis=1)[0]

                idx, history = process_output(idx_, history)

                t2 = time.time()
                print(f"{index} {catigories[idx]}")

                current_time = t2 - t1

            img = cv2.resize(img, (640, 480))
            img = img[:, ::-1]
            height, width, _ = img.shape
            label = np.zeros([height // 10, width, 3]).astype('uint8') + 255

            cv2.putText(label, 'Prediction: ' + catigories[idx],
                        (0, int(height / 16)),
                        cv2.FONT_HERSHEY_SIMPLEX,
                        0.7, (0, 0, 0), 2)
            cv2.putText(label, '{:.1f} Vid/s'.format(1 / current_time),
                        (width - 170, int(height / 16)),
                        cv2.FONT_HERSHEY_SIMPLEX,
                        0.7, (0, 0, 0), 2)

            img = np.concatenate((img, label), axis=0)
            cv2.imshow(WINDOW_NAME, img)

            key = cv2.waitKey(1)
            if key & 0xFF == ord('q') or key == 27:  # exit
                break
            elif key == ord('F') or key == ord('f'):  # full screen
                print('Changing full screen option!')
                full_screen = not full_screen
                if full_screen:
                    print('Setting FS!!!')
                    cv2.setWindowProperty(WINDOW_NAME, cv2.WND_PROP_FULLSCREEN,
                                          cv2.WINDOW_FULLSCREEN)
                else:
                    cv2.setWindowProperty(WINDOW_NAME, cv2.WND_PROP_FULLSCREEN,
                                          cv2.WINDOW_NORMAL)

            if t is None:
                t = time.time()
            else:
                nt = time.time()
                index += 1
                t = nt

        cap.release()
        cv2.destroyAllWindows()


main()

I got the following error

Open camera...
C:\Users\jaina\AppData\Local\Programs\Python\Python37\lib\site-packages\torchvision\transforms\transforms.py:256: UserWarning: The use of the transforms.Scale transform is deprecated, please use transforms.Resize instead.
  warnings.warn("The use of the transforms.Scale transform is deprecated, " +
Ready!
Traceback (most recent call last):
  File "main.py", line 319, in <module>
    main()
  File "main.py", line 245, in main
    outputs = model(input_var, buffer)
  File "C:\Users\jaina\AppData\Local\Programs\Python\Python37\lib\site-packages\torch\nn\modules\module.py", line 722, in _call_impl
    result = self.forward(*input, **kwargs)
  File "C:\Users\jaina\projects\temporal-shift-module\online_demo\mobilenet_v2_tsm.py", line 150, in forward
    x, s = f(x, shift_buffer[shift_buffer_idx])
  File "C:\Users\jaina\AppData\Local\Programs\Python\Python37\lib\site-packages\torch\nn\modules\module.py", line 722, in _call_impl
    result = self.forward(*input, **kwargs)
  File "C:\Users\jaina\projects\temporal-shift-module\online_demo\mobilenet_v2_tsm.py", line 96, in forward
    return x + self.conv(torch.cat((shift_buffer, x2), dim=1)), x1
TypeError: expected Tensor as element 0 in argument 0, but got tuple

I think it has someting to do with the forward func in mobilenet_v2_tsm.py line 93

def forward(self, x, shift_buffer):
        c = x.size(1)
        x1, x2 = x[:, : c // 8], x[:, c // 8:]
        return x + self.conv(torch.cat((shift_buffer, x2), dim=1)), x1

Please help.

[wjc2b]

Hello！I also facing the question now！Have you solved the problem？If solved, could you share the solution?

I think I have solved this problem. try replacing this two lines outputs = model(input_var, buffer) feat, buffer = outputs[0], outputs[1] to outputs = model(input_var, *buffer) feat, buffer = outputs[0], outputs[1:]

[jainal09]

Hi anyone active? Please help on this issue!