RuntimeError: Found dtype Double but expected Float

[AnyAdapter]

--- load weight finish ---
Setting up a new session...
Max_iter = 120000, Batch_size = 20
Model will train on cuda:[0]
--- Focal_loss alpha = 0.25 ,将对背景类进行衰减,请在目标检测任务中使用 ---
--- Multiboxloss : α=0.25 γ=2 num_classes=21
Set optimizer : SGD (
Parameter Group 0
dampening: 0
initial_lr: 0.001
lr: 0.001
momentum: 0.9
nesterov: False
weight_decay: 0.0005
)
Set scheduler : <torch.optim.lr_scheduler.MultiStepLR object at 0x7f7d7f196e20>
Set lossfunc : multiboxloss(
(loc_loss_fn): SmoothL1Loss()
(cls_loss_fn): focal_loss()
)
Start Train......

---

/home/pdj/PycharmProjects/lyy/Retinanet-Pytorch/Data/Transfroms_utils.py:263: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray
mode = random.choice(self.sample_options)
/home/pdj/PycharmProjects/lyy/Retinanet-Pytorch/Data/Transfroms_utils.py:263: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray
mode = random.choice(self.sample_options)
Traceback (most recent call last):
File "/home/pdj/PycharmProjects/lyy/Retinanet-Pytorch/Demo_train.py", line 36, in
trainer(net, train_dataset)
File "/home/pdj/PycharmProjects/lyy/Retinanet-Pytorch/Model/trainer.py", line 122, in call
loss.backward()
File "/home/pdj/anaconda3/envs/lyy/lib/python3.8/site-packages/torch/tensor.py", line 221, in backward
torch.autograd.backward(self, gradient, retain_graph, create_graph)
File "/home/pdj/anaconda3/envs/lyy/lib/python3.8/site-packages/torch/autograd/init.py", line 130, in backward
Variable._execution_engine.run_backward(
RuntimeError: Found dtype Double but expected Float

Process finished with exit code 1
请问个是为什么，我在Transforms.py中明明看到有ConvertFromInts()
并且在Transforms_utils.py中明明看到有return image.astype(np.float32), boxes, labels
为什么就报RuntimeError: Found dtype Double but expected Float这个错误了呢，
难道是 上面VisibleDeprecationWarning这个的问题。
库版本如下：
python 3.8.5 h7579374_1
pytorch 1.7.0 py3.8_cuda10.1.243_cudnn7.6.3_0 pytorch
torchvision 0.8.1 py38_cu101 pytorch
numpy 1.19.4 pypi_0 pypi
opencv-python 4.4.0.46 pypi_0 pypi
yacs 0.1.8 pypi_0 pypi
visdom 0.1.8.9 pypi_0 pypi
vizer 0.1.5 pypi_0 pypi

[lzb1]

你好，我也有这个错误，请问你是如何解决的呢