modify ParallelAttention

dcu_megatron/adaptor/megatron_adaptor.py

@@ -141,9 +141,9 @@ class CoreAdaptation(MegatronAdaptationABC):
         MegatronAdaptation.register('megatron.core.transformer.moe.moe_utils.topk_softmax_with_capacity',
                                     torch.compile(options={"triton.cudagraphs": True, "triton.cudagraph_trees": False}),
                                     apply_wrapper=True)
-        # MegatronAdaptation.register('megatron.core.transformer.moe.moe_utils.switch_load_balancing_loss_func',
-        #                             torch.compile(options={"triton.cudagraphs": True, "triton.cudagraph_trees": False, "triton.cudagraph_support_input_mutation":True}),
-        #                             apply_wrapper=True)
+        MegatronAdaptation.register('megatron.core.transformer.moe.moe_utils.switch_load_balancing_loss_func',
+                                    torch.compile(options={"triton.cudagraphs": True, "triton.cudagraph_trees": False, "triton.cudagraph_support_input_mutation":True}),
+                                    apply_wrapper=True)
         MegatronAdaptation.register('megatron.core.transformer.moe.moe_utils.permute',
                                     torch.compile(mode='max-autotune-no-cudagraphs'),
                                     apply_wrapper=True)
@@ -233,13 +233,21 @@ class LegacyAdaptation(MegatronAdaptationABC):
         self.patch_legacy_models()
 
     def patch_legacy_models(self):
-        from ..legacy.model.transformer import ParallelMLPPatch, ParallelAttentionPatch
+        from ..legacy.model.transformer import (
+            parallel_mlp_init_wrapper,
+            ParallelAttentionPatch,
+            parallel_attention_init_wrapper
+        )
         from ..legacy.model.utils import get_norm
 
         # ParallecMLP
         MegatronAdaptation.register('megatron.legacy.model.transformer.ParallelMLP.__init__',
-                                    ParallelMLPPatch.__init__)
+                                    parallel_mlp_init_wrapper,
+                                    apply_wrapper=True)
 
+        MegatronAdaptation.register('megatron.legacy.model.transformer.ParallelAttention.__init__',
+                                    parallel_attention_init_wrapper,
+                                    apply_wrapper=True)
         MegatronAdaptation.register('megatron.legacy.model.transformer.ParallelAttention.forward',
                                     ParallelAttentionPatch.forward)
 

dcu_megatron/legacy/model/transformer.py

@@ -6,80 +6,83 @@ from megatron.core import tensor_parallel
 from megatron.legacy.model.enums import AttnType
 from megatron.core.models.common.embeddings import apply_rotary_pos_emb
 from megatron.legacy.model.module import MegatronModule
-from megatron.legacy.model.transformer import ParallelMLP
-from megatron.legacy.model.utils import (
-    erf_gelu,
-    openai_gelu,
-)
 
 try:
     from einops import rearrange
 except ImportError:
     rearrange = None
 
-class ParallelMLPPatch(MegatronModule):
-    """MLP.
-
-    MLP will take the input with h hidden state, project it to 4*h
-    hidden dimension, perform nonlinear transformation, and project the
-    state back into h hidden dimension.
-    """
-    def __init__(self, config, is_expert=False):
-        super(ParallelMLP, self).__init__()
-        args = get_args()
+try: # 使用定长fa
+    from flash_attn import flash_attn_func
+except ImportError:
+    flash_attn_func = None
 
-        self.add_bias = config.add_bias_linear
-
-        ffn_hidden_size = config.ffn_hidden_size
-        if config.gated_linear_unit:
-            ffn_hidden_size *= 2
-
-        # Project to 4h. If using swiglu double the output width, see https://arxiv.org/pdf/2002.05202.pdf
-        self.dense_h_to_4h = tensor_parallel.ColumnParallelLinear(
-            config.hidden_size,
-            ffn_hidden_size,
-            config=config,
-            init_method=config.init_method,
-            bias=self.add_bias,
-            gather_output=False,
-            skip_bias_add=True,
-            is_expert=is_expert,
-        )
 
-        self.bias_gelu_fusion = False
-        self.activation_func = None
-        self.swiglu = args.swiglu
+def parallel_mlp_init_wrapper(fn):
+    @wraps(fn)
+    def wrapper(self, *args, **kwargs):
+        fn(self, *args, **kwargs)
 
-        if args.openai_gelu:
-            self.activation_func = openai_gelu
-        elif args.onnx_safe:
-            self.activation_func = erf_gelu
-        elif args.swiglu:
+        args = get_args()
+        if args.swiglu:
             @torch.compile(mode="max-autotune-no-cudagraphs")
             def swiglu(x):
                 x = torch.chunk(x, 2, dim=-1)
                 return F.silu(x[0]) * x[1]
             self.activation_func = swiglu
-        elif args.squared_relu:
-            def squared_relu(x):
-                return torch.pow(F.relu(x), 2)
-            self.activation_func = squared_relu
-        else:
-            self.bias_gelu_fusion = args.bias_gelu_fusion
-            self.activation_func = F.gelu
-
-        # Project back to h.
-        self.dense_4h_to_h = tensor_parallel.RowParallelLinear(
-            config.ffn_hidden_size,
-            config.hidden_size,
-            config=config,
-            init_method=config.output_layer_init_method,
-            bias=self.add_bias,
-            skip_bias_add=True,
-            input_is_parallel=True,
-            is_expert=is_expert,
+
+    return wrapper
+
+
+class FlashFixedSelfAttention(torch.nn.Module):
+    """Implement the scaled dot product attention with softmax.
+    Arguments
+    ---------
+        softmax_scale: The temperature to use for the softmax attention.
+                      (default: 1/sqrt(d_keys) where d_keys is computed at
+                      runtime)
+        attention_dropout: The dropout rate to apply to the attention
+                           (default: 0.0)
+    """
+    def __init__(self, causal=False, softmax_scale=None, attention_dropout=0.0,
+                 device=None, dtype=None):
+        super().__init__()
+        assert flash_attn_func is not None, ('Please install FlashAttention first, '
+                                                      'e.g., with pip install flash-attn')
+        assert rearrange is not None, 'Please install einops first, e.g., with pip install einops'
+        self.causal = causal
+        self.softmax_scale = softmax_scale
+        self.dropout_p = attention_dropout
+
+        self.flash_attn_func = flash_attn_func
+
+    def forward(self, q, k, v):
+        """Implements the multihead softmax attention.
+        Arguments
+        ---------
+            q, k, v: The tensor containing the query, key, and value. (B, S, H, D)
+        """
+
+        assert all((i.dtype in [torch.float16, torch.bfloat16] for i in (q,k,v)))
+        assert all((i.is_cuda for i in (q,k,v)))
+
+        output = self.flash_attn_func(q, k, v, dropout_p=self.dropout_p, softmax_scale=self.softmax_scale, causal=self.causal)
+        # [b,s,a,dim]
+        return output
+
+
+def parallel_attention_init_wrapper(fn):
+    @wraps(fn)
+    def wrapper(self, *args, **kwargs):
+        fn(self, *args, **kwargs)
+
+        if self.use_flash_attn:
+            self.core_attention_flash = FlashFixedSelfAttention(
+                causal=True, attention_dropout=self.config.attention_dropout
             )
 
+    return wrapper
+
 
 class ParallelAttentionPatch(MegatronModule):
     """Parallel self-attention layer abstract class.
@@ -87,6 +90,7 @@ class ParallelAttentionPatch(MegatronModule):
     Self-attention layer takes input with size [s, b, h]
     and returns output of the same size.
     """
+
     def forward(self, hidden_states, attention_mask,
                 encoder_output=None, inference_params=None,
                 rotary_pos_emb=None):