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# -------------------------------------------------------------------------# Copyright (c) Microsoft Corporation. All rights reserved.# Licensed under the MIT License.# --------------------------------------------------------------------------from logging import getLogger
import numpy as npfrom fusion_base import Fusionfrom fusion_utils import FusionUtilsfrom onnx import TensorProto, helper, numpy_helperfrom onnx_model import OnnxModel
logger = getLogger(__name__)
class FusionGptAttentionPastBase(Fusion): """Base class for GPT Attention Fusion with past state"""
def __init__(self, model: OnnxModel, num_heads: int): super().__init__(model, "Attention", ["LayerNormalization", "SkipLayerNormalization"], "with past") self.num_heads = num_heads self.utils = FusionUtils(model) self.casted_attention_mask = {} # map from name of attention mask to the name that casted to int32 self.mask_filter_value = None
def match_past_pattern_1(self, concat_k, concat_v, output_name_to_node): # Pattern 1: # {past} # / \ # / \ # Gather(axes=0, indices=0) Gather(indices=1) # | | # Transpose (perm=0,1,3,2) | # | | # Concat_k Concat_v # | / # Transpose (perm=0,1,3,2) / # | / # Unsqueeze Unsqueeze # \ / # \ / # Concat # | # {present} gather = self.model.get_parent(concat_v, 0, output_name_to_node) if gather.op_type != "Gather": logger.debug("match_past_pattern_1: expect Gather for past") return None
if not self.model.find_constant_input(gather, 1) == 1: logger.debug("match_past_pattern_1: expect indices=1 for Gather of past") return None past = gather.input[0]
parent = self.model.get_parent(concat_k, 0, output_name_to_node) if parent.op_type == "Gather": gather_past_k = parent else: past_k_nodes = self.model.match_parent_path(concat_k, ["Transpose", "Gather"], [0, 0]) if past_k_nodes is None: logger.debug("match_past_pattern_1: failed match Transpose and Gather") return None gather_past_k = past_k_nodes[-1]
if not self.model.find_constant_input(gather_past_k, 0) == 1: logger.debug("match_past_pattern_1: expect indices=0 for Gather k of past") return None past_k = gather_past_k.input[0] if past != past_k: logger.debug("match_past_pattern_1: expect past to be same") return None
return past
def match_past_pattern_2(self, concat_k, concat_v, output_name_to_node): # Pattern 2: # Split (QKV) # / | | # / | +----------------------+ # | | # | {past} | # | | | # Reshape Split Reshape # | / \ | # Transpose_k Squeeze Squeeze Transpose_v # | | \ / # +------|---+ \ / # | | \ / # Concat_k Concat_v # | | # Unsqueeze Unsqueeze # \ / # Concat # | # {present} # squeeze = self.model.get_parent(concat_v, 0, output_name_to_node) if squeeze.op_type != "Squeeze": logger.debug("match_past_pattern_2: expect Squeeze as parent of concat_v") return None
split = self.model.get_parent(squeeze, 0, output_name_to_node) if split.op_type != "Split": logger.debug("match_past_pattern_2: expect Split for past path") return None
opset_version = self.model.get_opset_version() if opset_version < 13: if not FusionUtils.check_node_attribute(squeeze, "axes", [0]): logger.debug("match_past_pattern_2: axes != [0] for Squeeze in past path") return None
if not FusionUtils.check_node_attribute(split, "split", [1, 1]): logger.debug("match_past_pattern_2: split != [1, 1] for Split in past path") return None else: if not self.utils.check_node_input_value(squeeze, 1, [0]): logger.debug("match_past_pattern_2: axes != [0] for Squeeze in past path") return None
if not self.utils.check_node_input_value(split, 1, [1, 1]): logger.debug("match_past_pattern_2: split != [1, 1] for Split in past path") return None
if not FusionUtils.check_node_attribute(split, "axis", 0, default_value=0): logger.debug("match_past_pattern_2: attribute axis of Split are not expected in past path") return None past = split.input[0]
past_k_nodes = self.model.match_parent_path(concat_k, ["Squeeze", "Split"], [0, 0]) if past_k_nodes is None: logger.debug("match_past_pattern_2: failed to match past_k_nodes path") return None past_k = past_k_nodes[-1].input[0]
if past != past_k: logger.info("match_past_pattern_2: expect past to be same") return None
return past
def match_present(self, concat_v, input_name_to_nodes): unsqueeze_present_v = self.model.find_first_child_by_type( concat_v, "Unsqueeze", input_name_to_nodes, recursive=False ) if not unsqueeze_present_v: logger.info("expect unsqueeze for present") return None concat_present = self.model.find_first_child_by_type( unsqueeze_present_v, "Concat", input_name_to_nodes, recursive=False ) if not concat_present: logger.info("expect concat for present") return None
present = concat_present.output[0] return present
def cast_attention_mask(self, input_name): if input_name in self.casted_attention_mask: attention_mask_input_name = self.casted_attention_mask[input_name] elif self.model.find_graph_input(input_name): casted, attention_mask_input_name = self.utils.cast_graph_input_to_int32(input_name) self.casted_attention_mask[input_name] = attention_mask_input_name else: attention_mask_input_name, cast_node = self.utils.cast_input_to_int32(input_name) self.casted_attention_mask[input_name] = attention_mask_input_name return attention_mask_input_name
class FusionGptAttention(FusionGptAttentionPastBase): """
Fuse GPT-2 Attention with past state subgraph into one Attention node. """
def __init__(self, model: OnnxModel, num_heads: int): super().__init__(model, num_heads)
def create_attention_node( self, fc_weight, fc_bias, gemm_qkv, past, present, input, output, mask, is_unidirectional, ): attention_node_name = self.model.create_node_name("GptAttention") attention_node = helper.make_node( "Attention", inputs=[input, fc_weight, fc_bias, mask, past], outputs=[attention_node_name + "_output", present], name=attention_node_name, ) attention_node.domain = "com.microsoft" attention_node.attribute.extend( [ helper.make_attribute("num_heads", self.num_heads), helper.make_attribute("unidirectional", 1 if is_unidirectional else 0), ] )
if self.mask_filter_value is not None: attention_node.attribute.extend([helper.make_attribute("mask_filter_value", float(self.mask_filter_value))])
matmul_node = helper.make_node( "MatMul", inputs=[attention_node_name + "_output", gemm_qkv.input[1]], outputs=[attention_node_name + "_matmul_output"], name=attention_node_name + "_matmul", )
add_node = helper.make_node( "Add", inputs=[attention_node_name + "_matmul_output", gemm_qkv.input[2]], outputs=[output], name=attention_node_name + "_add", ) self.nodes_to_add.extend([attention_node, matmul_node, add_node]) self.node_name_to_graph_name[attention_node.name] = self.this_graph_name self.node_name_to_graph_name[matmul_node.name] = self.this_graph_name self.node_name_to_graph_name[add_node.name] = self.this_graph_name
def fuse(self, normalize_node, input_name_to_nodes, output_name_to_node): past = None present = None return_indice = []
is_normalize_node_skiplayernorm = normalize_node.op_type == "SkipLayerNormalization" qkv_nodes = None
if not is_normalize_node_skiplayernorm: qkv_nodes = self.model.match_parent_path( normalize_node, ["Add", "Reshape", "Gemm", "Reshape", "Reshape", "Transpose", "MatMul"], [0, None, 0, 0, 0, 0, 0], output_name_to_node=output_name_to_node, return_indice=return_indice, ) # yapf: disable else: qkv_nodes = self.model.match_parent_path( normalize_node, ["Reshape", "Gemm", "Reshape", "Reshape", "Transpose", "MatMul"], [None, 0, 0, 0, 0, 0], output_name_to_node=output_name_to_node, return_indice=return_indice, ) # yapf: disable
if qkv_nodes is None: return
another_input = None if not is_normalize_node_skiplayernorm: ( add_qkv, reshape_qkv, gemm_qkv, reshape_1, reshape_2, transpose_qkv, matmul_qkv, ) = qkv_nodes
another_input = add_qkv.input[1 - return_indice[0]] else: ( reshape_qkv, gemm_qkv, reshape_1, reshape_2, transpose_qkv, matmul_qkv, ) = qkv_nodes
v_nodes = self.model.match_parent_path(matmul_qkv, ["Concat", "Transpose", "Reshape", "Split"], [1, 1, 0, 0]) if v_nodes is None: logger.debug("fuse_attention: failed to match v path") return (concat_v, transpose_v, reshape_v, split_fc) = v_nodes
# Try match pattern using Gemm + LayerNormalization fc_nodes = self.model.match_parent_path( split_fc, ["Reshape", "Gemm", "Reshape", "LayerNormalization"], [0, 0, 0, 0], output_name_to_node, )
# Try match pattern using Gemm + SkipLayerNormalization if fc_nodes is None: fc_nodes = self.model.match_parent_path( split_fc, ["Reshape", "Gemm", "Reshape", "SkipLayerNormalization"], [0, 0, 0, 0], output_name_to_node, )
# Try match pattern using MatMul if fc_nodes is None: # LayerNormalization fc_nodes = self.model.match_parent_path( split_fc, ["Add", "MatMul", "LayerNormalization"], [0, None, 0], output_name_to_node, )
# SkipLayerNormalization if fc_nodes is None: fc_nodes = self.model.match_parent_path( split_fc, ["Add", "MatMul", "SkipLayerNormalization"], [0, None, 0], output_name_to_node, )
if fc_nodes is None: logger.debug("fuse_attention: failed to match fc path") return
fc_weight = fc_nodes[1].input[1] i, _ = self.model.get_constant_input(fc_nodes[0]) fc_bias = fc_nodes[0].input[i] else: fc_weight = fc_nodes[1].input[1] fc_bias = fc_nodes[1].input[2]
layernorm_before_attention = fc_nodes[-1]
# `another_input` will be non-None only if # (1) SkipLayerNorm fusion wasn't turned ON # (2) SkipLayerNorm fusion was turned ON but upstream layer's LayerNorm + Add was not # fused into a SkipLayerNorm. This can happen if the shapes to the Add node are different. # So, keep the following check if SkipLayerNorm fusion is turned ON or OFF. if another_input is not None and not another_input in layernorm_before_attention.input: logger.debug("Upstream Add and (Skip)LayerNormalization shall have one same input") return
is_unidirectional = True slice_mask = None input_mask_nodes = None concat_k_to_match = None qk_nodes = self.model.match_parent_path(matmul_qkv, ["Softmax", "Sub", "Mul", "Div", "MatMul"], [0, 0, 0, 0, 0]) if qk_nodes is not None: (softmax_qk, sub_qk, mul_qk, div_qk, matmul_qk) = qk_nodes mask_nodes = self.model.match_parent_path( sub_qk, [ "Mul", "Sub", "Slice", "Slice", "Unsqueeze", "Sub", "Squeeze", "Slice", "Shape", "Div", ], [1, 0, 1, 0, 1, 0, 0, 0, 0, 0], ) # yapf: disable if mask_nodes is None: logger.debug("fuse_attention: failed to match unidirectional mask path") return div_mask = mask_nodes[-1] slice_mask = mask_nodes[3]
if div_qk != div_mask: logger.debug("fuse_attention: skip since div_qk != div_mask") return
if len(mask_nodes) > 1 and mask_nodes[0].op_type == "Mul": _, mul_val = self.model.get_constant_input(mask_nodes[0]) if mul_val != -10000: self.mask_filter_value = -mul_val
else: # New pattern for gpt2 from PyTorch 1.5.0 and Transformers 2.9.0. i, qk_nodes, _ = self.model.match_parent_paths( matmul_qkv, [ (["Softmax", "Where", "Div", "MatMul"], [0, 0, 1, 0]), (["Softmax", "Add", "Where", "Div", "MatMul"], [0, 0, None, 1, 0]), ], output_name_to_node, ) if qk_nodes is None: logger.debug("fuse_attention: failed to match qk nodes") return
where_qk = qk_nodes[-3] div_qk = qk_nodes[-2] matmul_qk = qk_nodes[-1]
if i == 1: add_qk = qk_nodes[1] _, input_mask_nodes, _ = self.model.match_parent_paths( add_qk, [ ( ["Mul", "Sub", "Cast", "Unsqueeze", "Unsqueeze", "Reshape"], [None, 0, 1, 0, 0, 0], ), ( ["Mul", "Sub", "Unsqueeze", "Unsqueeze", "Reshape"], [None, 0, 1, 0, 0], ), ( ["Mul", "Sub", "Unsqueeze", "Unsqueeze"], [None, 0, 1, 0], ), # useless cast and reshape are removed. ], output_name_to_node, ) # yapf: disable if input_mask_nodes is None: logger.debug("fuse_attention: failed to match input attention mask path") return if len(input_mask_nodes) > 1 and input_mask_nodes[0].op_type == "Mul": _, mul_val = self.model.get_constant_input(input_mask_nodes[0]) if mul_val != -10000: self.mask_filter_value = mul_val
mask_nodes = self.model.match_parent_path( where_qk, [ "Cast", "Slice", "Slice", "Unsqueeze", "Sub", "Squeeze", "Slice", "Shape", ], [0, 0, 0, 1, 0, 0, 0, 0], output_name_to_node, ) # yapf: disable if mask_nodes is None: # TODO: match mask path for GPT2LMHeadModel_BeamSearchStep. logger.debug("fuse_attention: failed to match mask path") return
slice_mask = mask_nodes[2]
div_or_concat = self.model.get_parent(mask_nodes[-1], 0, output_name_to_node) if div_or_concat.op_type == "Div": div_mask = div_or_concat if div_qk != div_mask: logger.debug("fuse_attention: skip since div_qk != div_mask") return elif div_or_concat.op_type == "Concat": concat_k_to_match = div_or_concat else: logger.debug("fuse_attention: failed to match mask path")
# Validate that the mask data is either lower triangular (unidirectional) or all ones mask_data = numpy_helper.to_array(self.model.get_initializer(slice_mask.input[0])) if not ( len(mask_data.shape) == 4 and mask_data.shape[:2] == (1, 1) and mask_data.shape[2] == mask_data.shape[3] ): logger.debug("fuse_attention: skip since mask shape is not 1x1xWxW") return if np.allclose(mask_data, np.ones_like(mask_data)): is_unidirectional = False elif not np.allclose(mask_data, np.tril(np.ones_like(mask_data))): logger.debug("fuse_attention: skip since mask is neither lower triangular nor ones") return
q_nodes = self.model.match_parent_path(matmul_qk, ["Transpose", "Reshape", "Split"], [0, 0, 0]) if q_nodes is None: logger.debug("fuse_attention: failed to match q path") return (transpose_q, reshape_q, split_q) = q_nodes if split_fc != split_q: logger.debug("fuse_attention: skip since split_fc != split_q") return
k_nodes = self.model.match_parent_path(matmul_qk, ["Concat", "Transpose", "Reshape", "Split"], [1, 1, 0, 0]) if k_nodes is None: # This pattern is from pytorch 1.7.1 and transformers 4.6.1 k_nodes = self.model.match_parent_path( matmul_qk, ["Transpose", "Concat", "Transpose", "Reshape", "Split"], [1, 0, 1, 0, 0], ) if k_nodes is None: logger.debug("fuse_attention: failed to match k path") return else: (_, concat_k, transpose_k, reshape_k, split_k) = k_nodes else: (concat_k, transpose_k, reshape_k, split_k) = k_nodes if split_fc != split_k: logger.debug("fuse_attention: skip since split_fc != split_k") return
if concat_k_to_match and concat_k != concat_k_to_match: logger.debug("fuse_attention: skip since concat_k != concat_k_to_match") return
attention_mask_input_name = "" if input_mask_nodes is not None: input_name = input_mask_nodes[-1].input[0] attention_mask_input_name = self.cast_attention_mask(input_name)
# Match past and present paths past = self.match_past_pattern_1(concat_k, concat_v, output_name_to_node) or self.match_past_pattern_2( concat_k, concat_v, output_name_to_node ) if past is None: logger.info("fuse_attention: failed to match past path") return if not self.model.find_graph_input(past): logger.debug("past is not graph input.") # For GPT2LMHeadModel_BeamSearchStep, there is an extra Gather node to select beam index so it is not graph input.
present = self.match_present(concat_v, input_name_to_nodes) if present is None: logger.info("fuse_attention: failed to match present path") return if not self.model.find_graph_output(present): logger.info("expect present to be graph output") return
self.create_attention_node( fc_weight, fc_bias, gemm_qkv, past, present, layernorm_before_attention.output[0], reshape_qkv.output[0], attention_mask_input_name, is_unidirectional, )
# we rely on prune_graph() to clean old subgraph nodes: # qk_nodes + q_nodes + k_nodes + v_nodes + mask_nodes + [reshape_qkv, transpose_qkv, matmul_qkv] self.prune_graph = True
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