now completely OpenAI CLIP compatible for training

dalle2_pytorch/train.py

@@ -2,15 +2,6 @@ import copy
 import torch
 from torch import nn
 
-# image related normalizations
-# ddpms expect images to be in the range of -1 to 1
-
-def normalize_img(img):
-    return img * 2 - 1
-
-def unnormalize_img(normed_img):
-    return (normed_img + 1) * 0.5
-
 # exponential moving average wrapper
 
 class EMA(nn.Module):