Remove explicit device arguments

Differential Revision: D82239525

Pull Request resolved: pytorch#14619

Author: navsud

examples/models/llama/model_args.py

@@ -63,6 +63,9 @@ class ModelArgs:
     use_sdpa_with_kv_cache_op: bool = (
         False  # Use custom sdpa op that updates kv cache in-place
     )
+    # Device to use for the model: "cpu" or "cuda" (needed for QAT)
+    # Only used for creating Rope parameters
+    device: str = "cpu"
     # Generate logits for all inputs. When it's True, it would take big memory usage
     # at runtime. Enable it only necessary (e.g., use perplexity tools that requires
     # logits for all input tokens.)

examples/models/llama/rope.py

@@ -138,15 +138,19 @@ def forward(
 # and https://github.com/huggingface/transformers/blob/main/src/transformers/modeling_rope_utils.py#L242.
 # Current only support non-long rope.
 def hf_precompute_freqs_cis(
-    dim: int, end: int, theta: float, partial_rotary_factor: float = 1.0
+    dim: int,
+    end: int,
+    theta: float,
+    partial_rotary_factor: float = 1.0,
+    device: Union[str, torch.device] = "cpu",
 ):
     # Partial rotary embeddings.
     dim = int(dim * partial_rotary_factor)
 
     # Short factor scaling.
     freqs = 1.0 / (
         theta
-        ** (torch.arange(0, dim, 2, device="cpu", dtype=torch.int64).float() / dim)
+        ** (torch.arange(0, dim, 2, device=device, dtype=torch.int64).float() / dim)
     )
     # TODO: support long factor scaling.
 
@@ -236,6 +240,7 @@ def __init__(self, params: ModelArgs):
             self.precompute_freqs_cis = partial(
                 hf_precompute_freqs_cis,
                 partial_rotary_factor=self.params.partial_rotary_factor,
+                device=self.params.device,
             )
             self.apply_rotary_emb = hf_apply_rotary_emb
         else:
@@ -244,6 +249,7 @@ def __init__(self, params: ModelArgs):
                 use_scaled=self.params.use_scaled_rope,
                 scale_factor=self.params.rope_scale_factor,
                 high_freq_factor=self.params.high_freq_factor,
+                device=self.params.device,
             )
             self.apply_rotary_emb = RotaryEmbedding()