diff --git a/README.md b/README.md
index 27b89ba71..da78091ed 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+This is a fork created by Tail-19, aiming to make this repository work on M1 chip. The project has finished 🎉
+
 # NeRF-pytorch
 
 
diff --git a/requirements.txt b/requirements.txt
index 168d1b855..f3e3337e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-torch==1.11.0
+torch>=1.11.0
 torchvision>=0.9.1
 imageio
 imageio-ffmpeg
diff --git a/run_nerf.py b/run_nerf.py
index bc270be86..c81ac3eb4 100644
--- a/run_nerf.py
+++ b/run_nerf.py
@@ -19,7 +19,7 @@
 from load_LINEMOD import load_LINEMOD_data
 
 
-device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+device = torch.device("cuda" if torch.cuda.is_available() else "mps" if torch.mps.device_count() > 0 else "cpu")
 np.random.seed(0)
 DEBUG = False
 
@@ -275,7 +275,9 @@ def raw2outputs(raw, z_vals, rays_d, raw_noise_std=0, white_bkgd=False, pytest=F
     raw2alpha = lambda raw, dists, act_fn=F.relu: 1.-torch.exp(-act_fn(raw)*dists)
 
     dists = z_vals[...,1:] - z_vals[...,:-1]
-    dists = torch.cat([dists, torch.Tensor([1e10]).expand(dists[...,:1].shape)], -1)  # [N_rays, N_samples]
+    # print(type(dists))
+    # print(dists.device)
+    dists = torch.cat([dists, torch.Tensor([1e10]).expand(dists[...,:1].shape).to("mps")], -1)  # [N_rays, N_samples]
 
     dists = dists * torch.norm(rays_d[...,None,:], dim=-1)
 
@@ -765,7 +767,7 @@ def train():
         img_loss = img2mse(rgb, target_s)
         trans = extras['raw'][...,-1]
         loss = img_loss
-        psnr = mse2psnr(img_loss)
+        psnr = mse2psnr(img_loss)   
 
         if 'rgb0' in extras:
             img_loss0 = img2mse(extras['rgb0'], target_s)
@@ -873,6 +875,9 @@ def train():
 
 
 if __name__=='__main__':
-    torch.set_default_tensor_type('torch.cuda.FloatTensor')
-
+    # torch.set_default_tensor_type('torch.mps.FloatTensor')
+    torch.set_default_tensor_type('torch.FloatTensor')
+    
+    torch.set_default_dtype(torch.float32)
+    torch.set_default_device(torch.device("mps"))
     train()
diff --git a/run_nerf_helpers.py b/run_nerf_helpers.py
index bc6ee779d..e7cb73836 100644
--- a/run_nerf_helpers.py
+++ b/run_nerf_helpers.py
@@ -7,7 +7,7 @@
 
 # Misc
 img2mse = lambda x, y : torch.mean((x - y) ** 2)
-mse2psnr = lambda x : -10. * torch.log(x) / torch.log(torch.Tensor([10.]))
+mse2psnr = lambda x : -10. * torch.log(x) / torch.log(torch.Tensor([10.]).to(x.device))
 to8b = lambda x : (255*np.clip(x,0,1)).astype(np.uint8)