[not for land] TE experiments

Summary:

Test Plan:

```
with-proxy CUDA_VISIBLE_DEVICES=4,5,6,7 NGPU=4 CONFIG_FILE="./train_configs/debug_model.toml" ./run_llama_train.sh --training.use_te
```

Reviewers:

Subscribers:

Tasks:

Tags:

test/test_te.py

@@ -0,0 +1,113 @@
+import copy
+
+import torch
+import torch.nn as nn
+
+# path hack, TODO remove
+import sys
+sys.path.insert(0, '/home/vasiliy/local/torchtitan/')
+import torchtitan.te_utils as te_utils
+from torchtitan.models.norms import build_norm
+from torchtitan.models.llama.model import FeedForward
+
+import transformer_engine.pytorch as te
+from transformer_engine.common.recipe import Format, DelayedScaling
+
+# torch.use_deterministic_algorithms(True)
+torch.manual_seed(0)
+
+fp8_format = Format.HYBRID
+fp8_recipe = DelayedScaling(fp8_format=fp8_format, amax_history_len=16, amax_compute_algo="max")
+maybe_te_float8_ctx = te.fp8_autocast(enabled=True, fp8_recipe=fp8_recipe)
+
+def test_linear_module_swap():
+    x = torch.randn(32, 32, device='cuda')
+
+    m = nn.Sequential(nn.Linear(32, 32)).cuda()
+    te_utils.swap_linear_to_te_linear(m)
+    print(m)
+    m = torch.compile(m)
+
+    with maybe_te_float8_ctx:
+        y = m(x)
+    y.sum().backward()
+
+    print('done')
+
+# Subsection of TransformerBlock with only the ffn norm and the ffn
+class NormFFNBlock(nn.Module):
+    def __init__(self, dim, hidden_dim, multiple_of):
+        super().__init__()
+        self.ffn_norm = build_norm("rmsnorm", dim, eps=1e-12)
+        self.feed_forward = FeedForward(dim, hidden_dim, multiple_of, None)
+
+    def forward(self, h):
+        out = h + self.feed_forward(self.ffn_norm(h))
+        return out
+
+def SQNR(x, y):
+    return 20 * torch.log10(
+        torch.linalg.norm(x) / torch.linalg.norm(x - y)
+    )
+
+def test_norm_ffn_rewrite():
+    dim = 256
+    hidden_dim = 512
+    multiple_of = 1
+
+    x = torch.randn(1, 128, 256).cuda().bfloat16()
+    x_copy = copy.deepcopy(x)
+
+    m = NormFFNBlock(dim, hidden_dim, multiple_of).cuda().bfloat16()
+    m_copy = copy.deepcopy(m)
+    print(m)
+
+    y = m(x)
+    y.sum().backward()
+
+    te_utils.swap_norm_ffn_to_te_friendly_norm_ffn(m_copy)
+    print(m_copy)
+
+    y_copy = m_copy(x_copy)
+    y_copy.sum().backward()
+
+    # TODO: debug why not an exact match
+    print(torch.allclose(y, y_copy))
+    print(SQNR(y, y_copy))
+
+    # TODO test w13
+    # assert torch.allclose(m.ffn.w2.grad, m_copy.ffn.w2.grad, atol=0, rtol=0)
+
+    te_utils.swap_te_friendly_norm_ffn_to_te_layernorm_linear(m_copy)
+    print(m_copy)
+
+    y_copy2 = m_copy(x_copy)
+    print(torch.allclose(y_copy, y_copy2))
+    print(SQNR(y_copy, y_copy2))
+
+# works, so a bug in the swap above?
+def test_split_linear():
+    M, K, N = 32, 64, 128
+    # M, K, N = 4, 6, 8
+
+    x = torch.randn(M, K)
+
+    fc1 = nn.Linear(K, N, bias=False)
+    fc2 = nn.Linear(K, N, bias=False)
+
+    fc3 = nn.Linear(K, N * 2, bias=False)
+    fc3.weight = torch.nn.Parameter(
+        torch.cat([copy.deepcopy(fc1.weight), copy.deepcopy(fc2.weight)], dim=0)
+    )
+
+    y1 = fc1(x)
+    y2 = fc2(x)
+    y3 = fc3(x)
+    y3_1, y3_2 = torch.split(y3, fc3.out_features // 2, dim=-1)
+
+    assert torch.allclose(y1, y3_1)
+    assert torch.allclose(y2, y3_2)
+
+
+if __name__ == '__main__':
+    test()

torchtitan/config_manager.py

@@ -373,6 +373,53 @@ def __init__(self):
             action="store_true",
             help="Whether to compile the model",
         )
+        self.parser.add_argument(
+            "--training.compile_ln_linear",
+            action="store_true",
+            help="Whether to compile only the LNLinear blocks",
+        )
+        self.parser.add_argument(
+            "--training.horizontally_fuse_fcs",
+            action="store_true",
+            help="""
+                If true, fuses ffn.fc1 and ffn.fc3 into ffn.fc13. Note that this is required
+                to use te.LayerNormLinear for FFNs.
+                TODO also implement this for attention.
+            """,
+        )
+        self.parser.add_argument(
+            "--training.te_swap_linear",
+            action="store_true",
+            help="""
+                If true, swaps torch.nn.Linear with te.Linear 
+                (not for land)
+                
+                Note:
+                * requires training.te_float8_autocast to use float8
+            """,
+        )
+        self.parser.add_argument(
+            "--training.te_swap_ln_linear",
+            action="store_true",
+            help="""
+                If true, swaps NormFeedForward.norm_w13 from 
+                nn.Sequential(RMSNorm, nn.Linear) to te.LayerNormLinear 
+                (not for land)
+
+                Note:
+                * requires training.horizontally_fuse_fcs to enable this swap
+                * this swap happens strictly before `training.te_swap_linear` if both are enabled
+                * requires training.te_float8_autocast to use float8
+            """,
+        )
+        self.parser.add_argument(
+            "--training.te_float8_autocast",
+            action="store_true",
+            help="""
+                If true, enables TE's float8 autocast context manager 
+                (not for land)
+            """,
+        )
         self.parser.add_argument(
             "--training.gc_freq",
             type=int,

torchtitan/float8.py

@@ -97,11 +97,13 @@ def convert_to_float8_training(self, model: nn.Module):
             model,
             config=self.config,
             module_filter_fn=lambda mod, fqn: fqn != "output",
+            # module_filter_fn=lambda mod, fqn: fqn != "output" and "norm_w13" in fqn,
         )
         logger.info(
             "Swapped to Float8Linear layers with enable_fsdp_float8_all_gather="
             f"{self.config.enable_fsdp_float8_all_gather}"
         )
+        print(model)
 
     def precompute_float8_dynamic_scale_for_fsdp(
         self, model: Union[nn.Module, List[nn.Module]]

torchtitan/models/llama/__init__.py

@@ -29,10 +29,12 @@
 }
 
 llama3_configs = {
-    "debugmodel": ModelArgs(dim=256, n_layers=8, n_heads=16, rope_theta=500000),
+    # "debugmodel": ModelArgs(dim=256, n_layers=8, n_heads=16, rope_theta=500000),
+    "debugmodel": ModelArgs(dim=256, n_layers=1, n_heads=16, rope_theta=500000),
     "8B": ModelArgs(
         dim=4096,
         n_layers=32,
+        # n_layers=1,
         n_heads=32,
         n_kv_heads=8,
         ffn_dim_multiplier=1.3,

torchtitan/parallelisms/parallelize_llama.py

@@ -22,6 +22,7 @@
 from torch.distributed._tensor import Replicate, Shard
 from torch.distributed.algorithms._checkpoint.checkpoint_wrapper import (
     checkpoint_wrapper as ptd_checkpoint_wrapper,
+		apply_activation_checkpointing,
 )
 from torch.distributed.tensor.parallel import (
     ColwiseParallel,
@@ -75,7 +76,7 @@ def parallelize_llama(
                 "fused_rmsnorm is not compatible with torch.compile yet. "
                 "Please use rmsnorm or layernorm."
             )
-        apply_compile(model)
+        apply_compile(model, job_config)
 
     if (
         parallel_dims.dp_shard_enabled
@@ -243,15 +244,44 @@ def apply_tp(
 }
 
 
+import transformer_engine.pytorch as te
+rng_seed = 1234
+torch.manual_seed(rng_seed)
+torch.cuda.manual_seed(rng_seed)
+CUDA_RNG_STATES_TRACKER = te.distributed.CudaRNGStatesTracker()
+CUDA_RNG_STATES_TRACKER.add("model-parallel-rng", rng_seed)
+
+
+def get_cuda_rng_tracker():
+    return CUDA_RNG_STATES_TRACKER
+
+
 def _apply_ac_to_transformer_block(module: nn.Module, ac_config):
-    valid_ac_modes = ("full", "selective")
+    valid_ac_modes = ("full", "selective", "full_te")
     if ac_config.mode not in valid_ac_modes:
         raise ValueError(
             f"Invalid AC mode: {ac_config.mode}. Valid modes: {valid_ac_modes}"
         )
 
     if ac_config.mode == "full":
         return ptd_checkpoint_wrapper(module, preserve_rng_state=False)
+    elif ac_config.mode == "full_te":
+        # copy-paste from https://github.com/NVIDIA/TransformerEngine/blob/64126aa8c469b2a97ace01f925f3d5786d5fd1bb/examples/pytorch/fsdp/fsdp.py, apply_fsdp_checkpointing
+        # note:
+        # LLaMa 3 8B on 8 H100s with this option: 
+        # 42.27 GiB, 4880 tps, strictly worse than PT-D's full AC. Have not done debugging
+        # on the cause yet.
+
+        wrapper = lambda m: ptd_checkpoint_wrapper(
+            m,
+            checkpoint_fn=te.distributed.checkpoint,
+            use_reentrant=False,
+            get_rng_state_tracker=get_cuda_rng_tracker,
+        )
+        def check_fn(submodule):
+            return True
+        apply_activation_checkpointing(module, checkpoint_wrapper_fn=wrapper, check_fn=check_fn)
+        return module
 
     assert ac_config.mode == "selective", f"{ac_config.mode}"
     use_op_sac = ac_config.selective_ac_option == "op"
@@ -314,16 +344,32 @@ def apply_ac(model: nn.Module, ac_config):
     logger.info(f"Applied {ac_config.mode} activation checkpointing to the model")
 
 
-def apply_compile(model: nn.Module):
+def apply_compile(model: nn.Module, job_config):
     """
     Apply torch.compile to each TransformerBlock, which makes compilation efficient due to
     repeated structure. Alternatively one can compile the whole model (after applying DP).
     """
-    for layer_id, transformer_block in model.layers.named_children():
-        transformer_block = torch.compile(transformer_block, fullgraph=True)
-        model.layers.register_module(layer_id, transformer_block)
+    if job_config.training.compile_ln_linear:
+        def _apply_compile(mod):
+            for name, child in mod.named_children():
+                # hacky check, but good enough for this use case
+                if isinstance(child, torch.nn.Sequential) and len(child) == 2:
+                    new_child = torch.compile(child)
+                    setattr(mod, name, new_child)
+                else:
+                    _apply_compile(child)
+
+        logger.info("Compiling each LNLinear with torch.compile")
+        _apply_compile(model)
+        print(model)
+        # TODO also option for just linear
+    else:
+        for layer_id, transformer_block in model.layers.named_children():
+            # transformer_block = torch.compile(transformer_block, fullgraph=True)
+            transformer_block = torch.compile(transformer_block, fullgraph=False)
+            model.layers.register_module(layer_id, transformer_block)
 
-    logger.info("Compiling each TransformerBlock with torch.compile")
+        logger.info("Compiling each TransformerBlock with torch.compile")
 
 
 def apply_fsdp(