[bugfix] Fix tensor device in Idefics2, Idefics3, and SmolVLM (#39975)

* [bugfix] ensure correct tensor device in Idefics2, Idefics3, and SmolVLM models

* to cuda

Author: qgallouedec

src/transformers/models/idefics2/modeling_idefics2.py

@@ -140,8 +140,12 @@ def forward(self, pixel_values: torch.FloatTensor, patch_attention_mask: torch.B
         embeddings = patch_embeds.flatten(2).transpose(1, 2)
 
         max_nb_patches_h, max_nb_patches_w = max_im_h // self.patch_size, max_im_w // self.patch_size
-        boundaries = torch.arange(1 / self.num_patches_per_side, 1.0, 1 / self.num_patches_per_side)
-        position_ids = torch.full(size=(batch_size, max_nb_patches_h * max_nb_patches_w), fill_value=0)
+        boundaries = torch.arange(
+            1 / self.num_patches_per_side, 1.0, 1 / self.num_patches_per_side, device=pixel_values.device
+        )
+        position_ids = torch.full(
+            size=(batch_size, max_nb_patches_h * max_nb_patches_w), fill_value=0, device=pixel_values.device
+        )
 
         for batch_idx, p_attn_mask in enumerate(patch_attention_mask):
             nb_patches_h = p_attn_mask[:, 0].sum()
@@ -157,9 +161,8 @@ def forward(self, pixel_values: torch.FloatTensor, patch_attention_mask: torch.B
             bucket_coords_w = torch.bucketize(fractional_coords_w, boundaries, right=True)
 
             pos_ids = (bucket_coords_h[:, None] * self.num_patches_per_side + bucket_coords_w).flatten()
-            position_ids[batch_idx][p_attn_mask.view(-1).cpu()] = pos_ids
+            position_ids[batch_idx][p_attn_mask.view(-1)] = pos_ids
 
-        position_ids = position_ids.to(self.position_embedding.weight.device)
         embeddings = embeddings + self.position_embedding(position_ids)
         return embeddings
 

src/transformers/models/idefics3/modeling_idefics3.py

@@ -140,8 +140,12 @@ def forward(self, pixel_values: torch.FloatTensor, patch_attention_mask: torch.B
         embeddings = patch_embeds.flatten(2).transpose(1, 2)
 
         max_nb_patches_h, max_nb_patches_w = max_im_h // self.patch_size, max_im_w // self.patch_size
-        boundaries = torch.arange(1 / self.num_patches_per_side, 1.0, 1 / self.num_patches_per_side)
-        position_ids = torch.full(size=(batch_size, max_nb_patches_h * max_nb_patches_w), fill_value=0)
+        boundaries = torch.arange(
+            1 / self.num_patches_per_side, 1.0, 1 / self.num_patches_per_side, device=pixel_values.device
+        )
+        position_ids = torch.full(
+            size=(batch_size, max_nb_patches_h * max_nb_patches_w), fill_value=0, device=pixel_values.device
+        )
 
         for batch_idx, p_attn_mask in enumerate(patch_attention_mask):
             nb_patches_h = p_attn_mask[:, 0].sum()
@@ -157,9 +161,8 @@ def forward(self, pixel_values: torch.FloatTensor, patch_attention_mask: torch.B
             bucket_coords_w = torch.bucketize(fractional_coords_w, boundaries, right=True)
 
             pos_ids = (bucket_coords_h[:, None] * self.num_patches_per_side + bucket_coords_w).flatten()
-            position_ids[batch_idx][p_attn_mask.view(-1).cpu()] = pos_ids
+            position_ids[batch_idx][p_attn_mask.view(-1)] = pos_ids
 
-        position_ids = position_ids.to(self.position_embedding.weight.device)
         embeddings = embeddings + self.position_embedding(position_ids)
         return embeddings
 

src/transformers/models/smolvlm/modeling_smolvlm.py

@@ -135,8 +135,12 @@ def forward(self, pixel_values: torch.FloatTensor, patch_attention_mask: torch.B
         embeddings = patch_embeds.flatten(2).transpose(1, 2)
 
         max_nb_patches_h, max_nb_patches_w = max_im_h // self.patch_size, max_im_w // self.patch_size
-        boundaries = torch.arange(1 / self.num_patches_per_side, 1.0, 1 / self.num_patches_per_side)
-        position_ids = torch.full(size=(batch_size, max_nb_patches_h * max_nb_patches_w), fill_value=0)
+        boundaries = torch.arange(
+            1 / self.num_patches_per_side, 1.0, 1 / self.num_patches_per_side, device=pixel_values.device
+        )
+        position_ids = torch.full(
+            size=(batch_size, max_nb_patches_h * max_nb_patches_w), fill_value=0, device=pixel_values.device
+        )
 
         for batch_idx, p_attn_mask in enumerate(patch_attention_mask):
             nb_patches_h = p_attn_mask[:, 0].sum()
@@ -152,9 +156,8 @@ def forward(self, pixel_values: torch.FloatTensor, patch_attention_mask: torch.B
             bucket_coords_w = torch.bucketize(fractional_coords_w, boundaries, right=True)
 
             pos_ids = (bucket_coords_h[:, None] * self.num_patches_per_side + bucket_coords_w).flatten()
-            position_ids[batch_idx][p_attn_mask.view(-1).cpu()] = pos_ids
+            position_ids[batch_idx][p_attn_mask.view(-1)] = pos_ids
 
-        position_ids = position_ids.to(self.position_embedding.weight.device)
         embeddings = embeddings + self.position_embedding(position_ids)
         return embeddings