move update outside policies

lerobot/common/policies/act/modeling_act.py

@@ -5,7 +5,6 @@ The majority of changes here involve removing unused code, unifying naming, and
 """
 
 import math
-import time
 from collections import deque
 from itertools import chain
 from typing import Callable
@@ -206,33 +205,6 @@ class ActionChunkingTransformerPolicy(nn.Module):
 
         return loss_dict
 
-    def update(self, batch, **_) -> dict:
-        """Run the model in train mode, compute the loss, and do an optimization step."""
-        start_time = time.time()
-        self.train()
-
-        batch = self.normalize_inputs(batch)
-
-        loss_dict = self.forward(batch)
-        # TODO(rcadene): self.unnormalize_outputs(out_dict)
-        loss = loss_dict["loss"]
-        loss.backward()
-
-        grad_norm = torch.nn.utils.clip_grad_norm_(
-            self.parameters(), self.cfg.grad_clip_norm, error_if_nonfinite=False
-        )
-
-        self.optimizer.step()
-        self.optimizer.zero_grad()
-
-        info = {
-            "loss": loss.item(),
-            "grad_norm": float(grad_norm),
-            "lr": self.cfg.lr,
-            "update_s": time.time() - start_time,
-        }
-
-        return info
 
     def _stack_images(self, batch: dict[str, Tensor]) -> dict[str, Tensor]:
         """Stacks all the images in a batch and puts them in a new key: "observation.images".

lerobot/common/policies/diffusion/modeling_diffusion.py

@@ -11,7 +11,6 @@ TODO(alexander-soare):
 import copy
 import logging
 import math
-import time
 from collections import deque
 from typing import Callable
 
@@ -155,41 +154,6 @@ class DiffusionPolicy(nn.Module):
         loss = self.diffusion.compute_loss(batch)
         return {"loss": loss}
 
-    def update(self, batch: dict[str, Tensor], **_) -> dict:
-        """Run the model in train mode, compute the loss, and do an optimization step."""
-        start_time = time.time()
-
-        self.diffusion.train()
-
-        batch = self.normalize_inputs(batch)
-
-        loss = self.forward(batch)["loss"]
-        loss.backward()
-
-        # TODO(rcadene): self.unnormalize_outputs(out_dict)
-
-        grad_norm = torch.nn.utils.clip_grad_norm_(
-            self.diffusion.parameters(),
-            self.cfg.grad_clip_norm,
-            error_if_nonfinite=False,
-        )
-
-        self.optimizer.step()
-        self.optimizer.zero_grad()
-        self.lr_scheduler.step()
-
-        if self.ema is not None:
-            self.ema.step(self.diffusion)
-
-        info = {
-            "loss": loss.item(),
-            "grad_norm": float(grad_norm),
-            "lr": self.lr_scheduler.get_last_lr()[0],
-            "update_s": time.time() - start_time,
-        }
-
-        return info
-
     def save(self, fp):
         torch.save(self.state_dict(), fp)
 

lerobot/scripts/train.py

@@ -1,4 +1,5 @@
 import logging
+import time
 from copy import deepcopy
 from pathlib import Path
 
@@ -7,6 +8,7 @@ import hydra
 import torch
 from datasets import concatenate_datasets
 from datasets.utils import disable_progress_bars, enable_progress_bars
+from torch import Tensor
 
 from lerobot.common.datasets.factory import make_dataset
 from lerobot.common.datasets.utils import cycle
@@ -14,14 +16,73 @@ from lerobot.common.envs.factory import make_env
 from lerobot.common.logger import Logger, log_output_dir
 from lerobot.common.policies.factory import make_policy
 from lerobot.common.utils.utils import (
-    format_big_number,
+        format_big_number,
-    get_safe_torch_device,
+        get_safe_torch_device,
-    init_logging,
+        init_logging,
-    set_global_seed,
+        set_global_seed,
 )
 from lerobot.scripts.eval import eval_policy
 
 
+def update_diffusion(self, policy, batch: dict[str, Tensor], **_) -> dict:
+        """Run the model in train mode, compute the loss, and do an optimization step."""
+        start_time = time.time()
+        policy.diffusion.train()
+        batch = policy.normalize_inputs(batch)
+        loss = policy.forward(batch)["loss"]
+        loss.backward()
+
+        # TODO(rcadene): self.unnormalize_outputs(out_dict)
+
+        grad_norm = torch.nn.utils.clip_grad_norm_(
+            policy.diffusion.parameters(),
+            policy.cfg.grad_clip_norm,
+            error_if_nonfinite=False,
+        )
+
+        policy.optimizer.step()
+        policy.optimizer.zero_grad()
+        policy.lr_scheduler.step()
+
+        if policy.ema is not None:
+            policy.ema.step(policy.diffusion)
+
+        info = {
+            "loss": loss.item(),
+            "grad_norm": float(grad_norm),
+            "lr": policy.lr_scheduler.get_last_lr()[0],
+            "update_s": time.time() - start_time,
+        }
+
+        return info
+
+
+
+def update_act(self, policy, batch: dict[str, Tensor], **_) -> dict:
+    start_time = time.time()
+    policy.train()
+    batch = policy.normalize_inputs(batch)
+    loss_dict = policy.forward(batch)
+    # TODO(rcadene): policy.unnormalize_outputs(out_dict)
+    loss = loss_dict["loss"]
+    loss.backward()
+
+    grad_norm = torch.nn.utils.clip_grad_norm_(
+        policy.parameters(), policy.cfg.grad_clip_norm, error_if_nonfinite=False
+    )
+
+    policy.optimizer.step()
+    policy.optimizer.zero_grad()
+
+    train_info = {
+        "loss": loss.item(),
+        "grad_norm": float(grad_norm),
+        "lr": policy.cfg.lr,
+        "update_s": time.time() - start_time,
+    }
+
+    return train_info
+
 @hydra.main(version_base=None, config_name="default", config_path="../configs")
 def train_cli(cfg: dict):
     train(
@@ -293,7 +354,12 @@ def train(cfg: dict, out_dir=None, job_name=None):
         for key in batch:
             batch[key] = batch[key].to(cfg.device, non_blocking=True)
 
-        train_info = policy.update(batch, step=step)
+        # Temporary hack to move update outside of policy
+        if isinstance(policy, DiffusionPolicy):
+            train_info = update_diffusion(policy, batch)
+        elif isinstance(policy, ActPolicy):
+            train_info = update_act(policy, batch)
+
 
         # TODO(rcadene): is it ok if step_t=0 = 0 and not 1 as previously done?
         if step % cfg.log_freq == 0: