Will this code correctly calculate a dataset's mean and std?

Does this code calculate the correct mean and std to use for torchvision.transforms.Normalize()?

import torch
import torchvision
import torchvision.transforms as transforms

# Calculate the mean and std of a dataset
def calc_data_mean(data_path):
    traindata = torchvision.datasets.ImageFolder(
    image_means = torch.stack([torch.mean(t, dim=(1, 2)) for t, c in traindata])
    image_means = image_means.mean(0)
    print('RGB mean:', image_means)
    image_stds = torch.stack([torch.std(t, dim=(1, 2)) for t, c in traindata])
    image_stds = image_stds.std(0)
    print('RGB std:', image_stds)