[Llama] Fix some tests, add tests for Llama 2 and CodeLlama

flash_attn/models/llama.py

@@ -13,6 +13,8 @@ import torch.nn.functional as F
 from sentencepiece import SentencePieceProcessor
 from transformers import GPT2Config, LlamaConfig
 
+from einops import rearrange
+
 
 def remap_state_dict_meta_llama(
     state_dict: dict[str, torch.Tensor], config: GPT2Config
@@ -30,9 +32,7 @@ def remap_state_dict_meta_llama(
     # Word embedding
     def key_mapping_emb(key):
         return re.sub(
-            r"^transformer.tok_embeddings.",
-            "transformer.embeddings.word_embeddings.",
-            key,
+            r"^transformer.tok_embeddings.", "transformer.embeddings.word_embeddings.", key
         )
 
     state_dict = OrderedDict((key_mapping_emb(k), v) for k, v in state_dict.items())
@@ -113,7 +113,7 @@ def remap_state_dict_meta_llama(
 
 
 def remap_state_dict_hf_llama(
-    state_dict: dict[str, torch.Tensor], config: GPT2Config, multi_query: bool = False
+    state_dict: dict[str, torch.Tensor], config: GPT2Config
 ) -> dict[str, torch.Tensor]:
     """Convert the state_dict in Hugging Face format to standard GPT format.
 
@@ -186,13 +186,11 @@ def remap_state_dict_hf_llama(
 
     state_dict = OrderedDict((key_mapping_ln(k), v) for k, v in state_dict.items())
 
-    def inv_permute(w, first_dim=None):
+    def inv_permute(w):
         # Inverse of permute implemented in:
         # https://github.com/huggingface/transformers/blob/b42010bb1d3cbf262d27e0a328661885be46dfdb/src/transformers/models/llama/convert_llama_weights_to_hf.py#L114
-        return (
-            w.reshape(first_dim or config.n_head, 2, -1, config.n_embd)
-            .transpose(1, 2)
-            .reshape(-1, config.n_embd)
+        return rearrange(
+            w, "(h two d) n -> (h d two) n", d=config.n_embd // config.n_head // 2, two=2
         )
 
     # Attention
@@ -202,8 +200,7 @@ def remap_state_dict_hf_llama(
         Wv = state_dict.pop(f"model.layers.{l}.self_attn.v_proj.weight")
 
         state_dict[f"transformer.layers.{l}.mixer.Wqkv.weight"] = torch.cat(
-            (inv_permute(Wq), inv_permute(Wk, getattr(config, "n_head_kv")), Wv),
-            dim=0,
+            [inv_permute(Wq), inv_permute(Wk), Wv], dim=0
         )
         # We don't store these
         state_dict.pop(f"model.layers.{l}.self_attn.rotary_emb.inv_freq", None)
@@ -220,7 +217,7 @@ def remap_state_dict_hf_llama(
 
 
 def inv_remap_state_dict_hf_llama(
-    state_dict: dict[str, torch.Tensor], config: GPT2Config, multi_query: bool = False
+    state_dict: dict[str, torch.Tensor], config: GPT2Config
 ) -> dict[str, torch.Tensor]:
     """Convert the state_dict in standard GPT format to Hugging Face format.
 
@@ -293,11 +290,9 @@ def inv_remap_state_dict_hf_llama(
 
     state_dict = OrderedDict((key_mapping_ln(k), v) for k, v in state_dict.items())
 
-    def permute(w, first_dim=None):
-        return (
-            w.view(first_dim or config.n_head, -1, 2, config.n_embd)
-            .transpose(1, 2)
-            .reshape(-1, config.n_embd)
+    def permute(w):
+        return rearrange(
+            w, "(h d two) n -> (h two d) n", d=config.n_embd // config.n_head // 2, two=2
         )
 
     n_head = config.n_head
@@ -316,7 +311,7 @@ def inv_remap_state_dict_hf_llama(
         Wk = Wqkv[q_dim : q_dim + k_dim]
         Wv = Wqkv[q_dim + k_dim : q_dim + k_dim + v_dim]
         state_dict[f"model.layers.{l}.self_attn.q_proj.weight"] = permute(Wq)
-        state_dict[f"model.layers.{l}.self_attn.k_proj.weight"] = permute(Wk, n_head_kv)
+        state_dict[f"model.layers.{l}.self_attn.k_proj.weight"] = permute(Wk)
         state_dict[f"model.layers.{l}.self_attn.v_proj.weight"] = Wv
         state_dict.pop(f"transformer.layers.{l}.attention.inner_attention.rope.freqs", None)
 

flash_attn/modules/mha.py

@@ -725,7 +725,7 @@ class ParallelMHA(nn.Module):
             process_group,
             bias=qkv_proj_bias,
             sequence_parallel=sequence_parallel,
-            multiple_of=self.head_dim * (self.num_heads_per_rank + 2 * self.num_heads_kv_per_rank),
+            multiple_of=self.head_dim * (self.num_heads // self.num_heads_kv + 2),
             **factory_kwargs,
         )
         inner_attn_cls = FlashSelfAttention if use_flash_attn else SelfAttention

tests/models/test_gpt_generation_parallel.py

@@ -160,6 +160,7 @@ def test_tensor_parallel(model_name, rotary, world_size):
     assert torch.allclose(
         torch.stack(out.scores, dim=1), torch.stack(scores, dim=1), rtol=rtol, atol=atol
     )
+    assert torch.equal(torch.stack(out.scores, dim=1), torch.stack(out_cg.scores, dim=1))
     if not rotary:
         assert torch.all(out.sequences == out_ref.sequences)
         assert torch.all(out.sequences == out_hf.sequences)

tests/models/test_llama.py

 # Copyright (c) 2023, Tri Dao.
 
-# To run the huggingface implementation, we first need to convert the weights:
+# To run the huggingface implementation of LLaMa (1), we first need to convert the weights:
 # https://github.com/huggingface/transformers/pull/21955
 # python -m transformers.models.llama.convert_llama_weights_to_hf --input_dir $CHECKPOINT_DIR/llama --model_size 7B --output_dir $CHECKPOINT_DIR/llama/7B-hf
 # and repeat for 13B, 30B, 65B
@@ -30,6 +30,7 @@ from flash_attn.utils.generation import update_graph_cache
 from flash_attn.utils.pretrained import state_dict_from_pretrained
 from transformers import LlamaConfig, LlamaTokenizer
 from transformers.models.llama.modeling_llama import LlamaForCausalLM
+from transformers import AutoConfig
 
 
 def _pretrained_state_dict_from_checkpoint(checkpoint_path, model_name, config, checkpoint_format):
@@ -60,9 +61,38 @@ def test_llama_state_dict(model_name):
         assert state_dict[k].shape == pretrained_state_dict[k].shape
 
 
-@pytest.mark.parametrize("model_name", ["7B", "13B"])
-@pytest.mark.parametrize("checkpoint_format", ["meta", "hf"])
-def test_llama_optimized(model_name, checkpoint_format):
+# TinyLlama-1.1B is to test MQA
+@pytest.mark.parametrize(
+    "model_name", ["meta-llama/Llama-2-7b-hf", "PY007/TinyLlama-1.1B-step-50K-105b"]
+)
+def test_inv_remap_state_dict_hf_llama(model_name):
+    config = llama_config_to_gpt2_config(
+        AutoConfig.from_pretrained(model_name, trust_remote_code=True)
+    )
+    state_dict = state_dict_from_pretrained(model_name)
+    # inv_remap_state_dict_hf_llama should be the inverse of remap_state_dict_hf_llama
+    state_dict = {key: val for key, val in state_dict.items() if "rotary_emb.inv_freq" not in key}
+    pretrained_state_dict = remap_state_dict_hf_llama(state_dict, config)
+    state_dict_recover = inv_remap_state_dict_hf_llama(pretrained_state_dict, config)
+    assert set(state_dict_recover.keys()) == set(state_dict.keys())
+    for key in state_dict_recover.keys():
+        torch.testing.assert_close(state_dict_recover[key], state_dict[key])
+
+
+# TinyLlama-1.1B is to test MQA
+@pytest.mark.parametrize(
+    "model_name",
+    [
+        "7B",  # Llama 1
+        "13B",  # Llama 1
+        "meta-llama/Llama-2-13b-hf",
+        "codellama/CodeLlama-7b-hf",
+        "codellama/CodeLlama-13b-hf",
+        "codellama/CodeLlama-34b-hf",
+        "PY007/TinyLlama-1.1B-step-50K-105b",
+    ],
+)
+def test_llama_optimized(model_name):
     """Check that our implementation of LLaMa (with all optimizations enabled) matches the
     HF implementation: the output of our forward pass in fp16 should be around the same as the HF
     forward pass in fp16, when compared to the HF forward pass in fp32.
@@ -73,7 +103,12 @@ def test_llama_optimized(model_name, checkpoint_format):
 
     dtype = torch.float16
     device = "cuda"
-    config = config_from_checkpoint(checkpoint_path, model_name, checkpoint_format)
+    if "/" in model_name:  # Download from HF
+        config = llama_config_to_gpt2_config(
+            AutoConfig.from_pretrained(model_name, trust_remote_code=True)
+        )
+    else:
+        config = config_from_checkpoint(checkpoint_path, model_name, checkpoint_format="meta")
         config = llama_config_to_gpt2_config(config)
     config.use_flash_attn = True
     config.fused_bias_fc = True
@@ -81,8 +116,13 @@ def test_llama_optimized(model_name, checkpoint_format):
     config.fused_dropout_add_ln = True
     config.residual_in_fp32 = True
 
+    if "/" in model_name:  # Download from HF
+        pretrained_state_dict = remap_state_dict_hf_llama(
+            state_dict_from_pretrained(model_name), config
+        )
+    else:
         pretrained_state_dict = _pretrained_state_dict_from_checkpoint(
-        checkpoint_path, model_name, config, checkpoint_format
+            checkpoint_path, model_name, config, checkpoint_format="meta"
         )
     model = GPTLMHeadModel(config, device=device, dtype=dtype)
     model.load_state_dict(pretrained_state_dict)
@@ -103,7 +143,8 @@ def test_llama_optimized(model_name, checkpoint_format):
     # Without device_map, the model is loaded on the CPU, which is very slow
     # Need auto here since the 13B fp32 model doesn't fit in memory on a A100 40GB
     model_ref = LlamaForCausalLM.from_pretrained(
-        Path(checkpoint_path) / f"{model_name}-hf", device_map="auto"
+        model_name if "/" in model_name else Path(checkpoint_path) / f"{model_name}-hf",
+        device_map="auto",
     )
     model_ref.eval()
     with torch.no_grad():
@@ -112,7 +153,9 @@ def test_llama_optimized(model_name, checkpoint_format):
     del model_ref
 
     model_hf = LlamaForCausalLM.from_pretrained(
-        Path(checkpoint_path) / f"{model_name}-hf", torch_dtype=dtype, device_map={"": device}
+        model_name if "/" in model_name else Path(checkpoint_path) / f"{model_name}-hf",
+        torch_dtype=dtype,
+        device_map={"": device},
     )
     model_hf.eval()
     with torch.no_grad():
@@ -135,77 +178,12 @@ def test_llama_optimized(model_name, checkpoint_format):
     ).abs().max().item()
 
 
-
-
-@pytest.mark.parametrize("model_name", ["PY007/TinyLlama-1.1B-step-50K-105b"])
-def test_mqa_optimized(model_name):
-    """Check that our implementation of Llama with MQA/GQA (with all optimizations enabled) matches the
-    HF implementation: the output of our forward pass in fp16 should be around the same as the HF
-    forward pass in fp16, when compared to the HF forward pass in fp32.
-    """
-    dtype = torch.float16
-    device = "cuda"
-    config = llama_config_to_gpt2_config(LlamaConfig.from_pretrained(model_name))
-    config.use_flash_attn = True  # FlashAttention-2 supports headdim 256
-    config.fused_bias_fc = True
-    config.fused_mlp = False
-    config.fused_dropout_add_ln = True
-    config.residual_in_fp32 = True
-
-    # Without device_map, the model is loaded on the CPU, which is very slow
-    model_ref = LlamaForCausalLM.from_pretrained(model_name, device_map={"": device})
-    model_ref.eval()
-
-    model = GPTLMHeadModel(config, device=device, dtype=dtype)
-    model.load_state_dict(remap_state_dict_hf_llama(model_ref.state_dict(), config))
-    model.eval()
-
-    torch.manual_seed(0)
-    batch_size = 2
-    max_seqlen = 256
-    input_ids = torch.randint(
-        0, config.vocab_size, (batch_size, max_seqlen), dtype=torch.long, device=device
-    )
-    with torch.no_grad():
-        out = model.transformer(input_ids)
-        logits = model(input_ids).logits
-    del model
-
-    with torch.no_grad():
-        out_ref = model_ref.model(input_ids).last_hidden_state
-        logits_ref = model_ref(input_ids).logits
-    del model_ref
-
-    model_hf = LlamaForCausalLM.from_pretrained(
-        model_name, torch_dtype=dtype, device_map={"": device}
-    )
-    model_hf.eval()
-    out_hf = model_hf.model(input_ids).last_hidden_state
-    logits_hf = model_hf(input_ids).logits
-    del model_hf
-
-    print(f"Output max diff: {(out - out_ref).abs().max().item()}")
-    print(f"Output mean diff: {(out - out_ref).abs().mean().item()}")
-    print(f"HF fp16 max diff: {(out_hf - out_ref).abs().max().item()}")
-    print(f"HF fp16 mean diff: {(out_hf - out_ref).abs().mean().item()}")
-    assert (out - out_ref).abs().max().item() < 3 * (
-        out_hf - out_ref
-    ).abs().max().item()
-
-    print(f"Logits max diff: {(logits - logits_ref).abs().max().item()}")
-    print(f"Logits mean diff: {(logits - logits_ref).abs().mean().item()}")
-    print(f"HF fp16 max diff: {(logits_hf - logits_ref).abs().max().item()}")
-    print(f"HF fp16 mean diff: {(logits_hf - logits_ref).abs().mean().item()}")
-    assert (logits - logits_ref).abs().max().item() < 3 * (
-        logits_hf - logits_ref
-    ).abs().max().item()
-
-
 # torchrun --no_python --nproc_per_node=2 pytest -q -s tests/models/test_llama.py -k "parallel"
 @pytest.mark.parametrize("world_size", [2])
-@pytest.mark.parametrize("model_name", ["13B"])
-@pytest.mark.parametrize("checkpoint_format", ["meta", "hf"])
-def test_llama_parallel(model_name, world_size, checkpoint_format):
+@pytest.mark.parametrize(
+    "model_name", ["13B", "meta-llama/Llama-2-13b-hf", "codellama/CodeLlama-34b-hf"]
+)
+def test_llama_parallel(model_name, world_size):
     """Check that our implementation of LLaMa (with all optimizations enabled) matches the
     HF implementation: the output of our forward pass in fp16 should be around the same as the HF
     forward pass in fp16, when compared to the HF forward pass in fp32.
@@ -217,7 +195,12 @@ def test_llama_parallel(model_name, world_size, checkpoint_format):
     )
 
     dtype = torch.float16
-    config = config_from_checkpoint(checkpoint_path, model_name, checkpoint_format)
+    if "/" in model_name:  # Download from HF
+        config = llama_config_to_gpt2_config(
+            AutoConfig.from_pretrained(model_name, trust_remote_code=True)
+        )
+    else:
+        config = config_from_checkpoint(checkpoint_path, model_name, checkpoint_format="meta")
         config = llama_config_to_gpt2_config(config)
     config.use_flash_attn = True
     config.fused_bias_fc = True
@@ -233,8 +216,13 @@ def test_llama_parallel(model_name, world_size, checkpoint_format):
     rank = parallel_state.get_tensor_model_parallel_rank()
     process_group = parallel_state.get_tensor_model_parallel_group()
 
+    if "/" in model_name:  # Download from HF
+        pretrained_state_dict = remap_state_dict_hf_llama(
+            state_dict_from_pretrained(model_name), config
+        )
+    else:
         pretrained_state_dict = _pretrained_state_dict_from_checkpoint(
-        checkpoint_path, model_name, config, checkpoint_format
+            checkpoint_path, model_name, config, checkpoint_format="meta"
         )
     model = GPTLMHeadModel(config, process_group=process_group, device=device, dtype=dtype)
     model.load_state_dict(shard_state_dict_tp(pretrained_state_dict, config, world_size, rank))
@@ -260,7 +248,8 @@ def test_llama_parallel(model_name, world_size, checkpoint_format):
     if rank == 0:
         # Without device_map, the model is loaded on the CPU, which is very slow
         model_ref = LlamaForCausalLM.from_pretrained(
-            Path(checkpoint_path) / f"{model_name}-hf", device_map="auto"
+            model_name if "/" in model_name else Path(checkpoint_path) / f"{model_name}-hf",
+            device_map="auto",
         )
         model_ref.eval()
         with torch.no_grad():
@@ -269,7 +258,9 @@ def test_llama_parallel(model_name, world_size, checkpoint_format):
         del model_ref
 
         model_hf = LlamaForCausalLM.from_pretrained(
-            Path(checkpoint_path) / f"{model_name}-hf", torch_dtype=dtype, device_map="auto"
+            model_name if "/" in model_name else Path(checkpoint_path) / f"{model_name}-hf",
+            torch_dtype=dtype,
+            device_map="auto",
         )
         model_hf.eval()
         with torch.no_grad():
@@ -405,9 +396,10 @@ def test_llama_generation(model_name, checkpoint_format):
 
 # torchrun --no_python --nproc_per_node=2 pytest -q -s tests/models/test_llama.py -k "llama_parallel_generation"
 @pytest.mark.parametrize("world_size", [2])
-@pytest.mark.parametrize("model_name", ["13B"])
-@pytest.mark.parametrize("checkpoint_format", ["meta", "hf"])
-def test_llama_parallel_generation(model_name, world_size, checkpoint_format):
+@pytest.mark.parametrize(
+    "model_name", ["13B", "meta-llama/Llama-2-13b-hf", "codellama/CodeLlama-34b-hf"]
+)
+def test_llama_parallel_generation(model_name, world_size):
     """Check that our implementation matches the HF implementation:
     the scores in fp16 should be around the same as the HF scores in fp16, when compared to
     the HF scores in fp32.
@@ -419,12 +411,17 @@ def test_llama_parallel_generation(model_name, world_size, checkpoint_format):
     )
 
     dtype = torch.float16
-    config = config_from_checkpoint(checkpoint_path, model_name, checkpoint_format)
+    if "/" in model_name:  # Download from HF
+        config = llama_config_to_gpt2_config(
+            AutoConfig.from_pretrained(model_name, trust_remote_code=True)
+        )
+    else:
+        config = config_from_checkpoint(checkpoint_path, model_name, checkpoint_format="meta")
         config = llama_config_to_gpt2_config(config)
-    config.use_flash_attn = False
+    config.use_flash_attn = True
     config.fused_bias_fc = True
     config.fused_mlp = False  # We don't have fused GatedMLP yet
-    config.fused_dropout_add_ln = False
+    config.fused_dropout_add_ln = True
     config.residual_in_fp32 = True
     config.pad_vocab_size_multiple = 8 * world_size
     config.sequence_parallel = False  # Need to set this to False for generation
@@ -450,8 +447,13 @@ def test_llama_parallel_generation(model_name, world_size, checkpoint_format):
     # GPU0 and GPU1 and things would hang
     torch.cuda.set_device(device)
 
+    if "/" in model_name:  # Download from HF
+        pretrained_state_dict = remap_state_dict_hf_llama(
+            state_dict_from_pretrained(model_name), config
+        )
+    else:
         pretrained_state_dict = _pretrained_state_dict_from_checkpoint(
-        checkpoint_path, model_name, config, checkpoint_format
+            checkpoint_path, model_name, config, checkpoint_format="meta"
         )
     model = GPTLMHeadModel(config, process_group=process_group, device=device, dtype=dtype)
     model.load_state_dict(shard_state_dict_tp(pretrained_state_dict, config, world_size, rank))
@@ -490,7 +492,9 @@ def test_llama_parallel_generation(model_name, world_size, checkpoint_format):
     if rank == 0:
         # Without device_map, the model is loaded on the CPU, which is very slow
         model_hf = LlamaForCausalLM.from_pretrained(
-            Path(checkpoint_path) / f"{model_name}-hf", torch_dtype=dtype, device_map="auto"
+            model_name if "/" in model_name else Path(checkpoint_path) / f"{model_name}-hf",
+            torch_dtype=dtype,
+            device_map="auto",
         )
         model_hf.eval()
         print("HF fp16")
@@ -508,7 +512,8 @@ def test_llama_parallel_generation(model_name, world_size, checkpoint_format):
         del model_hf
 
         model_ref = LlamaForCausalLM.from_pretrained(
-            Path(checkpoint_path) / f"{model_name}-hf", device_map="auto"
+            model_name if "/" in model_name else Path(checkpoint_path) / f"{model_name}-hf",
+            device_map="auto",
         )
         model_ref.eval()
         with torch.inference_mode():
@@ -594,15 +599,16 @@ def test_llama_parallel_uneven_num_heads(world_size):
 
     if rank == 0:
         model_ref = LlamaForCausalLM.from_pretrained(
-            Path(checkpoint_path) / f"{model_name}-hf", device_map="auto"
+            Path(checkpoint_path) / f"{model_name}-hf", device_map={"": device}
         )
+        model_ref = model_ref.to(device=device)
         model_ref.eval()
-        out_ref = model_ref.model(input_ids).last_hidden_state.to(device=device)
-        logits_ref = model_ref(input_ids).logits.to(device=device)
+        out_ref = model_ref.model(input_ids).last_hidden_state
+        logits_ref = model_ref(input_ids).logits
         del model_ref
 
         model_hf = LlamaForCausalLM.from_pretrained(
-            Path(checkpoint_path) / f"{model_name}-hf", torch_dtype=dtype, device_map="auto"
+            Path(checkpoint_path) / f"{model_name}-hf", torch_dtype=dtype, device_map={"": device}
         )
         model_hf.eval()
         out_hf = model_hf.model(input_ids).last_hidden_state.to(device=device)
@@ -625,42 +631,3 @@ def test_llama_parallel_uneven_num_heads(world_size):
 
         if os.path.exists(checkpoint_path / f"{model_name}-hf"):
             shutil.rmtree(checkpoint_path / f"{model_name}-hf")
-
-
-@torch.no_grad()
-def test_inv_remap_state_dict_hf_llama():
-    checkpoint_path = (
-        Path(os.environ.get("CHECKPOINT_DIR", current_dir.parent.parent / "checkpoints")) / "llama"
-    )
-    model_name = f"teeny"
-
-    llama_config = LlamaConfig(
-        num_attention_heads=2,
-        hidden_size=256 * 2,
-        intermediate_size=256 * 2 * 4,
-        num_hidden_layers=4,
-    )
-    config = llama_config_to_gpt2_config(llama_config)
-    config.use_flash_attn = True
-    config.fused_bias_fc = True
-    config.fused_mlp = False  # We don't have fused GatedMLP yet
-    config.fused_dropout_add_ln = True
-    config.residual_in_fp32 = True
-
-    # Set up.
-    LlamaForCausalLM(config=llama_config).save_pretrained(checkpoint_path / f"{model_name}-hf")
-
-    # inv_remap_state_dict_hf_llama should be the inverse of remap_state_dict_hf_llama
-    state_dict = state_dict_from_pretrained(checkpoint_path / f"{model_name}-hf")
-    state_dict = {key: val for key, val in state_dict.items() if "rotary_emb.inv_freq" not in key}
-    pretrained_state_dict = remap_state_dict_hf_llama(state_dict, config)
-    state_dict_recover = inv_remap_state_dict_hf_llama(pretrained_state_dict, config)
-
-    assert set(state_dict_recover.keys()) == set(state_dict.keys())
-
-    for key in state_dict_recover.keys():
-        torch.testing.assert_close(state_dict_recover[key], state_dict[key])
-
-    # Tear down.
-    if os.path.exists(checkpoint_path / f"{model_name}-hf"):
-        shutil.rmtree(checkpoint_path / f"{model_name}-hf")