add gitignore and update train.py

Author: bubbliiiing

.gitignore

@@ -1,3 +1,10 @@
+# ignore map, miou, datasets
+map_out/
+miou_out/
+VOCdevkit/
+datasets/
+Medical_Datasets/
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

train.py

@@ -239,7 +239,7 @@
         #-------------------------------------------------------------------#
         #   判断当前batch_size与64的差别，自适应调整学习率
         #-------------------------------------------------------------------#
-        nbs     = 64 if not Freeze_Train else 32 # nominal batch size
+        nbs     = 64 
         Init_lr = max(batch_size / nbs * Init_lr, 1e-4)
         Min_lr  = max(batch_size / nbs * Min_lr, 1e-6)