minor updates to remove outdated code

Author: Fangchang Ma

models.py

@@ -1,13 +1,10 @@
-import os
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
 import torchvision.models
 import collections
 import math
 
-oheight, owidth = 228, 304
-
 class Unpool(nn.Module):
     # Unpool: 2*2 unpooling with zero padding
     def __init__(self, num_channels, stride=2):
@@ -189,8 +186,6 @@ def __init__(self, layers, decoder, output_size, in_channels=3, pretrained=True)
         # define number of intermediate channels
         if layers <= 34:
             num_channels = 512
-            # Need to modify owidth for ResNet18 model.
-            owidth = 912
         elif layers >= 50:
             num_channels = 2048