[Feature] A2C compatibility with compile

ghstack-source-id: 6f2f140
Pull Request resolved: #2464

Author: Vincent Moens

benchmarks/test_objectives_benchmarks.py

@@ -50,7 +50,7 @@
 )  # Anything from 2.5, incl. nightlies, allows for fullgraph
 
 
-@pytest.fixture(scope="module")
+@pytest.fixture(scope="module", autouse=True)
 def set_default_device():
     cur_device = torch.get_default_device()
     device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")

sota-implementations/a2c/a2c_atari.py

@@ -3,6 +3,7 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 import hydra
+from tensordict.nn import CudaGraphModule
 from torchrl._utils import logger as torchrl_logger
 from torchrl.record import VideoRecorder
 
@@ -15,17 +16,21 @@ def main(cfg: "DictConfig"):  # noqa: F821
     import torch.optim
     import tqdm
 
-    from tensordict import TensorDict
+    from torchrl._utils import timeit
     from torchrl.collectors import SyncDataCollector
-    from torchrl.data import LazyMemmapStorage, TensorDictReplayBuffer
+    from torchrl.data import LazyTensorStorage, TensorDictReplayBuffer
     from torchrl.data.replay_buffers.samplers import SamplerWithoutReplacement
     from torchrl.envs import ExplorationType, set_exploration_type
     from torchrl.objectives import A2CLoss
     from torchrl.objectives.value.advantages import GAE
     from torchrl.record.loggers import generate_exp_name, get_logger
     from utils_atari import eval_model, make_parallel_env, make_ppo_models
 
-    device = "cpu" if not torch.cuda.device_count() else "cuda"
+    device = cfg.loss.device
+    if not device:
+        device = torch.device("cpu" if not torch.cuda.is_available() else "cuda:0")
+    else:
+        device = torch.device(device)
 
     # Correct for frame_skip
     frame_skip = 4
@@ -35,28 +40,12 @@ def main(cfg: "DictConfig"):  # noqa: F821
     test_interval = cfg.logger.test_interval // frame_skip
 
     # Create models (check utils_atari.py)
-    actor, critic, critic_head = make_ppo_models(cfg.env.env_name)
-    actor, critic, critic_head = (
-        actor.to(device),
-        critic.to(device),
-        critic_head.to(device),
-    )
-
-    # Create collector
-    collector = SyncDataCollector(
-        create_env_fn=make_parallel_env(cfg.env.env_name, cfg.env.num_envs, device),
-        policy=actor,
-        frames_per_batch=frames_per_batch,
-        total_frames=total_frames,
-        device=device,
-        storing_device=device,
-        max_frames_per_traj=-1,
-    )
+    actor, critic, critic_head = make_ppo_models(cfg.env.env_name, device=device)
 
     # Create data buffer
     sampler = SamplerWithoutReplacement()
     data_buffer = TensorDictReplayBuffer(
-        storage=LazyMemmapStorage(frames_per_batch),
+        storage=LazyTensorStorage(frames_per_batch, device=device),
         sampler=sampler,
         batch_size=mini_batch_size,
     )
@@ -67,6 +56,7 @@ def main(cfg: "DictConfig"):  # noqa: F821
         lmbda=cfg.loss.gae_lambda,
         value_network=critic,
         average_gae=True,
+        vectorized=not cfg.loss.compile,
     )
     loss_module = A2CLoss(
         actor_network=actor,
@@ -83,9 +73,10 @@ def main(cfg: "DictConfig"):  # noqa: F821
     # Create optimizer
     optim = torch.optim.Adam(
         loss_module.parameters(),
-        lr=cfg.optim.lr,
+        lr=torch.tensor(cfg.optim.lr, device=device),
         weight_decay=cfg.optim.weight_decay,
         eps=cfg.optim.eps,
+        capturable=device.type == "cuda",
     )
 
     # Create logger
@@ -115,16 +106,72 @@ def main(cfg: "DictConfig"):  # noqa: F821
         )
     test_env.eval()
 
+    # update function
+    def update(batch, max_grad_norm=cfg.optim.max_grad_norm):
+        # Forward pass A2C loss
+        loss = loss_module(batch)
+
+        loss_sum = loss["loss_critic"] + loss["loss_objective"] + loss["loss_entropy"]
+
+        # Backward pass
+        loss_sum.backward()
+        gn = torch.nn.utils.clip_grad_norm_(
+            loss_module.parameters(), max_norm=max_grad_norm
+        )
+
+        # Update the networks
+        optim.step()
+        optim.zero_grad(set_to_none=True)
+
+        return (
+            loss.select("loss_critic", "loss_entropy", "loss_objective")
+            .detach()
+            .set("grad_norm", gn)
+        )
+
+    compile_mode = None
+    if cfg.loss.compile:
+        compile_mode = cfg.loss.compile_mode
+        if compile_mode in ("", None):
+            if cfg.loss.cudagraphs:
+                compile_mode = "default"
+            else:
+                compile_mode = "reduce-overhead"
+        update = torch.compile(update, mode=compile_mode)
+        adv_module = torch.compile(adv_module, mode=compile_mode)
+
+    if cfg.loss.cudagraphs:
+        update = CudaGraphModule(update, in_keys=[], out_keys=[], warmup=5)
+        adv_module = CudaGraphModule(adv_module)
+
+    # Create collector
+    collector = SyncDataCollector(
+        create_env_fn=make_parallel_env(cfg.env.env_name, cfg.env.num_envs, device),
+        policy=actor,
+        frames_per_batch=frames_per_batch,
+        total_frames=total_frames,
+        device=device,
+        storing_device=device,
+        policy_device=device,
+        compile_policy={"mode": compile_mode} if cfg.loss.compile else False,
+        cudagraph_policy=cfg.loss.cudagraphs,
+    )
+
     # Main loop
     collected_frames = 0
     num_network_updates = 0
     start_time = time.time()
     pbar = tqdm.tqdm(total=total_frames)
     num_mini_batches = frames_per_batch // mini_batch_size
     total_network_updates = (total_frames // frames_per_batch) * num_mini_batches
+    lr = cfg.optim.lr
 
     sampling_start = time.time()
-    for i, data in enumerate(collector):
+    c_iter = iter(collector)
+    for i in range(len(collector)):
+        with timeit("collecting"):
+            torch.compiler.cudagraph_mark_step_begin()
+            data = next(c_iter)
 
         log_info = {}
         sampling_time = time.time() - sampling_start
@@ -144,61 +191,55 @@ def main(cfg: "DictConfig"):  # noqa: F821
                 }
             )
 
-        losses = TensorDict({}, batch_size=[num_mini_batches])
+        losses = []
         training_start = time.time()
 
         # Compute GAE
-        with torch.no_grad():
+        with torch.no_grad(), timeit("advantage"):
             data = adv_module(data)
         data_reshape = data.reshape(-1)
 
         # Update the data buffer
-        data_buffer.extend(data_reshape)
-
-        for k, batch in enumerate(data_buffer):
-
-            # Get a data batch
-            batch = batch.to(device)
-
-            # Linearly decrease the learning rate and clip epsilon
-            alpha = 1.0
-            if cfg.optim.anneal_lr:
-                alpha = 1 - (num_network_updates / total_network_updates)
-                for group in optim.param_groups:
-                    group["lr"] = cfg.optim.lr * alpha
-            num_network_updates += 1
-
-            # Forward pass A2C loss
-            loss = loss_module(batch)
-            losses[k] = loss.select(
-                "loss_critic", "loss_entropy", "loss_objective"
-            ).detach()
-            loss_sum = (
-                loss["loss_critic"] + loss["loss_objective"] + loss["loss_entropy"]
-            )
+        with timeit("emptying"):
+            data_buffer.empty()
+        with timeit("extending"):
+            data_buffer.extend(data_reshape)
 
-            # Backward pass
-            loss_sum.backward()
-            torch.nn.utils.clip_grad_norm_(
-                list(loss_module.parameters()), max_norm=cfg.optim.max_grad_norm
-            )
+        with timeit("optim"):
+            for batch in data_buffer:
+
+                # Linearly decrease the learning rate and clip epsilon
+                with timeit("optim - lr"):
+                    alpha = 1.0
+                    if cfg.optim.anneal_lr:
+                        alpha = 1 - (num_network_updates / total_network_updates)
+                        for group in optim.param_groups:
+                            group["lr"].copy_(lr * alpha)
 
-            # Update the networks
-            optim.step()
-            optim.zero_grad()
+                num_network_updates += 1
+
+                with timeit("optim - update"):
+                    torch.compiler.cudagraph_mark_step_begin()
+                    loss = update(batch)
+                losses.append(loss)
 
         # Get training losses
         training_time = time.time() - training_start
-        losses = losses.apply(lambda x: x.float().mean(), batch_size=[])
+        losses = torch.stack(losses).float().mean()
+
         for key, value in losses.items():
             log_info.update({f"train/{key}": value.item()})
         log_info.update(
             {
-                "train/lr": alpha * cfg.optim.lr,
+                "train/lr": lr * alpha,
                 "train/sampling_time": sampling_time,
                 "train/training_time": training_time,
+                **timeit.todict(prefix="time"),
             }
         )
+        if i % 200 == 0:
+            timeit.print()
+            timeit.erase()
 
         # Get test rewards
         with torch.no_grad(), set_exploration_type(ExplorationType.DETERMINISTIC):
@@ -223,7 +264,6 @@ def main(cfg: "DictConfig"):  # noqa: F821
             for key, value in log_info.items():
                 logger.log_scalar(key, value, collected_frames)
 
-        collector.update_policy_weights_()
         sampling_start = time.time()
 
     collector.shutdown()