vgg

1 files changed, 18 insertions, 0 deletions

diff --git a/dl/tutorials/utils.py b/dl/tutorials/utils.py
new file mode 100644
index 0000000..8368e94
--- /dev/null
+++ b/dl/tutorials/utils.py
@@ -0,0 +1,18 @@
+import torch
+from tqdm import tqdm
+
+
+def get_mean_and_std(dataset):
+    '''Compute the mean and std value of dataset.'''
+    '''dataset: 0-1 range (ToTensor())'''
+    dataloader = torch.utils.data.DataLoader(dataset, batch_size=1, shuffle=True, num_workers=2)
+    mean = torch.zeros(3)
+    std = torch.zeros(3)
+    print('==> Computing mean and std..')
+    for inputs, targets in tqdm(dataloader):
+        for i in range(3):
+            mean[i] += inputs[:, i, :, :].mean()
+            std[i] += inputs[:, i, :, :].std()
+    mean.div_(len(dataset))
+    std.div_(len(dataset))
+    return mean, std