diff --git a/ldm/models/diffusion/ddim.py b/ldm/models/diffusion/ddim.py
index edf1eaff..32b2b8b4 100644
--- a/ldm/models/diffusion/ddim.py
+++ b/ldm/models/diffusion/ddim.py
@@ -17,7 +17,7 @@ def __init__(self, model, schedule="linear", **kwargs):
 
     def register_buffer(self, name, attr):
         if type(attr) == torch.Tensor:
-            if attr.device != torch.device("cuda"):
+            if attr.device != torch.device("cuda") and torch.cuda.is_available():
                 attr = attr.to(torch.device("cuda"))
         setattr(self, name, attr)
 
diff --git a/ldm/models/diffusion/plms.py b/ldm/models/diffusion/plms.py
index 78eeb100..102957df 100644
--- a/ldm/models/diffusion/plms.py
+++ b/ldm/models/diffusion/plms.py
@@ -17,7 +17,7 @@ def __init__(self, model, schedule="linear", **kwargs):
 
     def register_buffer(self, name, attr):
         if type(attr) == torch.Tensor:
-            if attr.device != torch.device("cuda"):
+            if attr.device != torch.device("cuda") and torch.cuda.is_available():
                 attr = attr.to(torch.device("cuda"))
         setattr(self, name, attr)
 
diff --git a/ldm/modules/encoders/modules.py b/ldm/modules/encoders/modules.py
index aa3031df..6c7e0644 100644
--- a/ldm/modules/encoders/modules.py
+++ b/ldm/modules/encoders/modules.py
@@ -35,7 +35,7 @@ def forward(self, batch, key=None):
 
 class TransformerEmbedder(AbstractEncoder):
     """Some transformer encoder layers"""
-    def __init__(self, n_embed, n_layer, vocab_size, max_seq_len=77, device="cuda"):
+    def __init__(self, n_embed, n_layer, vocab_size, max_seq_len=77, device="cuda" if torch.cuda.is_available() else "cpu"):
         super().__init__()
         self.device = device
         self.transformer = TransformerWrapper(num_tokens=vocab_size, max_seq_len=max_seq_len,
@@ -52,7 +52,7 @@ def encode(self, x):
 
 class BERTTokenizer(AbstractEncoder):
     """ Uses a pretrained BERT tokenizer by huggingface. Vocab size: 30522 (?)"""
-    def __init__(self, device="cuda", vq_interface=True, max_length=77):
+    def __init__(self, device="cuda" if torch.cuda.is_available() else "cpu", vq_interface=True, max_length=77):
         super().__init__()
         from transformers import BertTokenizerFast  # TODO: add to reuquirements
         self.tokenizer = BertTokenizerFast.from_pretrained("bert-base-uncased")
@@ -80,7 +80,7 @@ def decode(self, text):
 class BERTEmbedder(AbstractEncoder):
     """Uses the BERT tokenizr model and add some transformer encoder layers"""
     def __init__(self, n_embed, n_layer, vocab_size=30522, max_seq_len=77,
-                 device="cuda",use_tokenizer=True, embedding_dropout=0.0):
+                 device="cuda" if torch.cuda.is_available() else "cpu", use_tokenizer=True, embedding_dropout=0.0):
         super().__init__()
         self.use_tknz_fn = use_tokenizer
         if self.use_tknz_fn:
@@ -139,7 +139,7 @@ class FrozenCLIPTextEmbedder(nn.Module):
     """
     Uses the CLIP transformer encoder for text.
     """
-    def __init__(self, version='ViT-L/14', device="cuda", max_length=77, n_repeat=1, normalize=True):
+    def __init__(self, version='ViT-L/14', device="cuda" if torch.cuda.is_available() else "cpu", max_length=77, n_repeat=1, normalize=True):
         super().__init__()
         self.model, _ = clip.load(version, jit=False, device="cpu")
         self.device = device
diff --git a/notebook_helpers.py b/notebook_helpers.py
index 5d0ebd7e..9e3dec35 100644
--- a/notebook_helpers.py
+++ b/notebook_helpers.py
@@ -44,7 +44,8 @@ def load_model_from_config(config, ckpt):
     sd = pl_sd["state_dict"]
     model = instantiate_from_config(config.model)
     m, u = model.load_state_dict(sd, strict=False)
-    model.cuda()
+    if torch.cuda.is_available():
+        model.cuda()
     model.eval()
     return {"model": model}, global_step
 
@@ -117,7 +118,8 @@ def get_cond(mode, selected_path):
         c = rearrange(c, '1 c h w -> 1 h w c')
         c = 2. * c - 1.
 
-        c = c.to(torch.device("cuda"))
+        if torch.cuda.is_available():
+            c = c.to(torch.device("cuda")) 
         example["LR_image"] = c
         example["image"] = c_up
 
diff --git a/scripts/knn2img.py b/scripts/knn2img.py
index e6eaaeca..a40ce710 100644
--- a/scripts/knn2img.py
+++ b/scripts/knn2img.py
@@ -53,7 +53,8 @@ def load_model_from_config(config, ckpt, verbose=False):
         print("unexpected keys:")
         print(u)
 
-    model.cuda()
+    if torch.cuda.is_available():
+        model.cuda() 
     model.eval()
     return model
 
@@ -358,7 +359,10 @@ def __call__(self, x, n):
                     uc = None
                     if searcher is not None:
                         nn_dict = searcher(c, opt.knn)
-                        c = torch.cat([c, torch.from_numpy(nn_dict['nn_embeddings']).cuda()], dim=1)
+                        nn_embeddings = torch.from_numpy(nn_dict['nn_embeddings'])
+                        if torch.cuda.is_available():
+                            nn_embeddings = nn_embeddings.cuda()
+                        c = torch.cat([c, nn_embeddings], dim=1)
                     if opt.scale != 1.0:
                         uc = torch.zeros_like(c)
                     if isinstance(prompts, tuple):
diff --git a/scripts/sample_diffusion.py b/scripts/sample_diffusion.py
index 876fe3c3..3a82185f 100644
--- a/scripts/sample_diffusion.py
+++ b/scripts/sample_diffusion.py
@@ -220,7 +220,8 @@ def get_parser():
 def load_model_from_config(config, sd):
     model = instantiate_from_config(config)
     model.load_state_dict(sd,strict=False)
-    model.cuda()
+    if torch.cuda.is_available():
+        model.cuda() 
     model.eval()
     return model
 
diff --git a/scripts/txt2img.py b/scripts/txt2img.py
index 613de5e1..ed0c8cd5 100644
--- a/scripts/txt2img.py
+++ b/scripts/txt2img.py
@@ -25,7 +25,8 @@ def load_model_from_config(config, ckpt, verbose=False):
         print("unexpected keys:")
         print(u)
 
-    model.cuda()
+    if torch.cuda.is_available():
+        model.cuda() 
     model.eval()
     return model