fix graph break for compile

src/axolotl/monkeypatch/utils.py

@@ -16,15 +16,24 @@ from transformers.utils import is_torch_bf16_gpu_available
 
 @torch.jit.script
 def get_max_seqlen_in_batch(attention_mask: torch.Tensor) -> torch.Tensor:
-    max_num = int(torch.max(attention_mask).item())
-    batch_size, _ = attention_mask.shape
-    counts = torch.zeros((batch_size, max_num), dtype=torch.int32)
-    for i in range(1, max_num + 1):
-        mask = attention_mask == i
-        counts[:, i - 1] = torch.sum(mask, dim=-1).to(dtype=torch.int32)
+    # Keep max_num as a tensor instead of extracting to Python int
+    max_num = torch.max(attention_mask)
+
+    # Create a range tensor for comparison
+    range_tensor = torch.arange(
+        1, max_num + 1, device=attention_mask.device, dtype=attention_mask.dtype
+    )
+
+    # Vectorized approach - compare attention_mask with each value in range
+    mask = attention_mask.unsqueeze(-1) == range_tensor.unsqueeze(0).unsqueeze(0)
+
+    # Sum along sequence dimension to get counts
+    counts = mask.sum(dim=1).to(dtype=torch.int32)
+
+    # Flatten and filter non-zero values
     result = counts.flatten()
-    nonzero_indices = torch.nonzero(result).squeeze(-1)
-    return result[nonzero_indices]
+    nonzero_mask = result != 0
+    return result[nonzero_mask]
 
 
 @torch.jit.script

src/axolotl/train.py

@@ -521,6 +521,11 @@ def train(
     """
     print_axolotl_text_art()
 
+    if cfg.activation_memory_budget is not None:
+        torch._functorch.config.activation_memory_budget = (  # pylint: disable=protected-access
+            cfg.activation_memory_budget
+        )
+
     # Setup model, tokenizer, (causal or RLHF) trainer, etc.
     (
         trainer,

src/axolotl/utils/schemas/config.py

@@ -182,6 +182,7 @@ class AxolotlInputConfig(
         default=False
     )
     gradient_checkpointing_kwargs: dict[str, Any] | None = None
+    activation_memory_budget: float | None = None
 
     unfrozen_parameters: list[str] | None = None
 
@@ -1079,6 +1080,19 @@ class AxolotlInputConfig(
             )
         return data
 
+    @model_validator(mode="before")
+    @classmethod
+    def check_activation_memory_budget_w_compile(cls, data):
+        if data.get("activation_memory_budget") is not None and not data.get(
+            "torch_compile"
+        ):
+            LOG.warning(
+                "activation_memory_budget is enabled, but torch_compile is not set. "
+                "Automatically setting torch_compile to true."
+            )
+            data["torch_compile"] = True
+        return data
+
     @model_validator(mode="before")
     @classmethod
     def check_npu_config(cls, data):