From ad02b249f5bf8e494c35a313f44515b7b1e6739d Mon Sep 17 00:00:00 2001
From: AUTOMATIC <16777216c@gmail.com>
Date: Thu, 8 Sep 2022 15:49:47 +0300
Subject: [PATCH] add a helpful message when user puts RealESRGAN model into
 ESRGAN directory.

---
 modules/esrgan_model.py | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/modules/esrgan_model.py b/modules/esrgan_model.py
index 2ed1d2739..e86ad775a 100644
--- a/modules/esrgan_model.py
+++ b/modules/esrgan_model.py
@@ -14,17 +14,20 @@ import modules.images
 
 def load_model(filename):
     # this code is adapted from https://github.com/xinntao/ESRGAN
-    if torch.has_mps:
-        map_l = 'cpu'
-    else:
-        map_l = None
-    pretrained_net = torch.load(filename, map_location=map_l)
+    pretrained_net = torch.load(filename, map_location='cpu' if torch.has_mps else None)
     crt_model = arch.RRDBNet(3, 3, 64, 23, gc=32)
 
     if 'conv_first.weight' in pretrained_net:
         crt_model.load_state_dict(pretrained_net)
         return crt_model
 
+    if 'model.0.weight' not in pretrained_net:
+        is_realesrgan = "params_ema" in pretrained_net and 'body.0.rdb1.conv1.weight' in pretrained_net["params_ema"]
+        if is_realesrgan:
+            raise Exception("The file is a RealESRGAN model, it can't be used as a ESRGAN model.")
+        else:
+            raise Exception("The file is not a ESRGAN model.")
+
     crt_net = crt_model.state_dict()
     load_net_clean = {}
     for k, v in pretrained_net.items():