Add VAE to meatada, add no_metadata option

library/train_util.py

@@ -749,16 +749,16 @@ def default(val, d):
 
 
 def model_hash(filename):
-    try:
-        with open(filename, "rb") as file:
-            import hashlib
-            m = hashlib.sha256()
+  try:
+    with open(filename, "rb") as file:
+      import hashlib
+      m = hashlib.sha256()
 
-            file.seek(0x100000)
-            m.update(file.read(0x10000))
-            return m.hexdigest()[0:8]
-    except FileNotFoundError:
-        return 'NOFILE'
+      file.seek(0x100000)
+      m.update(file.read(0x10000))
+      return m.hexdigest()[0:8]
+  except FileNotFoundError:
+    return 'NOFILE'
 
 
 # flash attention forwards and backwards