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import copy
import functools
import math
import time
from collections import defaultdict
from typing import Dict, Optional, Tuple
import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
from tqdm import tqdm
from transformers import Cache, LlamaConfig, LlamaForCausalLM
from transformers.models.llama.modeling_llama import (LlamaAttention,
LlamaDecoderLayer,
apply_rotary_pos_emb,
repeat_kv)
from transformers.pytorch_utils import Conv1D
from tensorrt_llm._utils import torch_to_numpy
def generate_int8(weights, act_range, is_qkv=False, multi_query_mode=False):
"""
This function has two purposes:
- compute quantized weights, scaled either per-tensor or per-column
- compute scaling factors
Depending on the GEMM API (CUTLASS/CUBLAS) the required scaling factors differ.
CUTLASS uses two sets of scaling factors. One for the activation X, one for the weight W.
CUBLAS only has one (we can't do per-row scaling). So we must provide pre-multiplied scaling factor.
Here is the list of what we need (T means per-tensor, C per-column):
- scale_x_orig_quant puts fp activation into the quantized range (i.e. [-128, 127], for int8). Used before the GEMM. (T)
- scale_y_quant_orig puts quantized activation into the fp range. Used if the GEMM outputs int8. (T)
- scale_w_quant_orig puts weights from quant range to fp range (used with CUTLASS) (T, C)
- scale_y_accum_quant puts the GEMM result (XW) from accumulation range (int32)
to quant range (int8) (used for CUBLAS) (T, C)
Note that we don't do anything special about row-parallel GEMM. Theoretically, we could have per-GPU scaling factors too,
but then the model would change depending on the number of GPUs used.
For QKV projection, the behavior is special. Even if we have a single matrix to perform QKV projection, we consider it
as three different matrices: Q, K, and V. So per-tensor actually means one scaling factor for each Q, K and V.
For our GEMM implementation to respect this behavior, we use per-column mode and replicate values along columns.
"""
# compute weight scaling factors for fp->int8 and int8->fp
fp32_weight = weights.to(torch.float32).cpu()
if is_qkv and not multi_query_mode:
scale_w_orig_quant_t = 127. / act_range["w"].reshape(3, -1).max(
dim=-1, keepdims=True)[0].cpu().numpy()
scale_w_orig_quant_c = 127. / act_range["w"].reshape(3,
-1).cpu().numpy()
elif is_qkv and multi_query_mode:
hidden_dim = fp32_weight.shape[0]
local_dim = act_range["w"].shape[0]
kv_dim = (local_dim - hidden_dim) // 2
scale_w_q = act_range["w"][0:hidden_dim]
scale_w_k = act_range["w"][hidden_dim:hidden_dim + kv_dim]
scale_w_v = act_range["w"][-kv_dim:]
scale_w_qkv_t = torch.concat([
scale_w_q.max(dim=0, keepdim=True)[0],
scale_w_k.max(dim=0, keepdim=True)[0],
scale_w_v.max(dim=0, keepdim=True)[0]
])
scale_w_orig_quant_t = 127. / scale_w_qkv_t.cpu().numpy()
scale_w_orig_quant_c = 127. / act_range["w"].cpu().numpy()
else:
scale_w_orig_quant_t = 127. / act_range["w"].max().cpu().numpy()
scale_w_orig_quant_c = 127. / act_range["w"].cpu().numpy()
scale_w_quant_orig_t = 1.0 / scale_w_orig_quant_t
scale_w_quant_orig_c = 1.0 / scale_w_orig_quant_c
scale_w_orig_quant_c = scale_w_orig_quant_c.astype(np.float32)
scale_w_orig_quant_t = scale_w_orig_quant_t.astype(np.float32)
# compute the rest of needed scaling factors
scale_x_orig_quant_t = np.array(127. / act_range["x"].max().item())
scale_y_orig_quant_t = np.array(127. / act_range["y"].max().item())
scale_y_quant_orig_t = np.array(act_range["y"].max().item() / 127.)
scale_y_accum_quant_t = scale_y_orig_quant_t / (scale_x_orig_quant_t *
scale_w_orig_quant_t)
scale_y_accum_quant_c = scale_y_orig_quant_t / (scale_x_orig_quant_t *
scale_w_orig_quant_c)
if is_qkv and not multi_query_mode:
scale_y_accum_quant_t = np.broadcast_to(scale_y_accum_quant_t,
scale_w_orig_quant_c.shape)
scale_w_quant_orig_t = np.broadcast_to(scale_w_quant_orig_t,
scale_w_orig_quant_c.shape)
if is_qkv and multi_query_mode:
scale_q_y_accum_t = np.broadcast_to(scale_y_accum_quant_t[0],
scale_w_q.shape)
scale_k_y_accum_t = np.broadcast_to(scale_y_accum_quant_t[1],
scale_w_k.shape)
scale_v_y_accum_t = np.broadcast_to(scale_y_accum_quant_t[2],
scale_w_v.shape)
scale_y_accum_quant_t = np.concatenate(
[scale_q_y_accum_t, scale_k_y_accum_t, scale_v_y_accum_t])
scale_w_quant_orig_t = np.concatenate([
np.broadcast_to(scale_w_quant_orig_t[0], scale_w_q.shape),
np.broadcast_to(scale_w_quant_orig_t[1], scale_w_k.shape),
np.broadcast_to(scale_w_quant_orig_t[2], scale_w_v.shape)
])
to_i8 = lambda x: torch_to_numpy(x.round().clip(-127, 127).to(torch.int8))
if is_qkv and multi_query_mode:
weight_int8 = to_i8(fp32_weight / scale_w_quant_orig_t)
else:
weight_int8 = to_i8(fp32_weight * scale_w_orig_quant_t)
return {
"weight.int8": weight_int8,
"weight.int8.col": to_i8(fp32_weight * scale_w_orig_quant_c),
"scale_x_orig_quant": scale_x_orig_quant_t.astype(np.float32),
"scale_w_quant_orig": scale_w_quant_orig_t.astype(np.float32),
"scale_w_quant_orig.col": scale_w_quant_orig_c.astype(np.float32),
"scale_y_accum_quant": scale_y_accum_quant_t.astype(np.float32),
"scale_y_accum_quant.col": scale_y_accum_quant_c.astype(np.float32),
"scale_y_quant_orig": scale_y_quant_orig_t.astype(np.float32),
}
@torch.no_grad()
def apply_smoothing(scales,
gemm_weights,
layernorm_weights=None,
layernorm_bias=None,
dtype=torch.float32,
layernorm_1p=False):
if not isinstance(gemm_weights, list):
gemm_weights = [gemm_weights]
if layernorm_weights is not None:
assert layernorm_weights.numel() == scales.numel()
layernorm_weights.div_(scales).to(dtype)
if layernorm_bias is not None:
assert layernorm_bias.numel() == scales.numel()
layernorm_bias.div_(scales).to(dtype)
if layernorm_1p:
layernorm_weights += (1 / scales) - 1
for gemm in gemm_weights:
gemm.mul_(scales.view(1, -1)).to(dtype)
@torch.no_grad()
def smooth_gemm(gemm_weights,
act_scales,
layernorm_weights=None,
layernorm_bias=None,
alpha=0.5,
weight_scales=None):
if not isinstance(gemm_weights, list):
gemm_weights = [gemm_weights]
orig_dtype = gemm_weights[0].dtype
for gemm in gemm_weights:
# gemm_weights are expected to be transposed
assert gemm.shape[1] == act_scales.numel()
if weight_scales is None:
weight_scales = torch.cat(
[gemm.abs().max(dim=0, keepdim=True)[0] for gemm in gemm_weights],
dim=0)
weight_scales = weight_scales.max(dim=0)[0]
weight_scales.to(float).clamp(min=1e-5)
scales = (act_scales.to(gemm_weights[0].device).to(float).pow(alpha) /
weight_scales.pow(1 - alpha)).clamp(min=1e-5)
apply_smoothing(scales, gemm_weights, layernorm_weights, layernorm_bias,
orig_dtype)
return scales
@torch.no_grad()
def capture_activation_range(model,
tokenizer,
dataset,
num_samples=1,
seq_len=512):
model.cuda().eval()
device = next(model.parameters()).device
act_scales = defaultdict(lambda: {"x": None, "y": None, "w": None})
# tokenizer.pad_token = tokenizer.eos_token
def stat_tensor(name, tensor, act_scales, key):
hidden_dim = tensor.shape[-1]
tensor = tensor.view(-1, hidden_dim).abs().detach()
comming_max = torch.max(tensor, dim=0)[0].float()
if act_scales[name][key] is None:
act_scales[name][key] = comming_max
else:
act_scales[name][key] = torch.max(act_scales[name][key],
comming_max)
def stat_input_hook(m, x, y, name):
if isinstance(x, tuple):
x = x[0]
stat_tensor(name, x, act_scales, "x")
stat_tensor(name, y, act_scales, "y")
if act_scales[name]["w"] is None:
act_scales[name]["w"] = m.weight.abs().clip(
1e-8, None).max(dim=1)[0].float()
hooks = []
for name, m in model.named_modules():
if isinstance(m, nn.Linear) or isinstance(m, Conv1D):
hooks.append(
m.register_forward_hook(
functools.partial(stat_input_hook, name=name)))
for i in tqdm(range(num_samples), desc="calibrating model"):
datapoint = dataset[i:i + 1]
line = copy.copy(datapoint)
line[0] = line[0] + ' TL;DR: '
line[0] = line[0].strip()
line[0] = line[0].replace(" n't", "n't")
# input_ids = tokenizer(line,
# return_tensors="pt",
# max_length=seq_len,
# padding=True,
# truncation=True).input_ids.to(device)
inputs = tokenizer.EncodeAsIds(line[0])
inputs = np.array([[tokenizer.bos_id()] + inputs], dtype=np.int32)
input_ids = torch.tensor(inputs, dtype=torch.int32).to(device)
model(input_ids)
for h in hooks:
h.remove()
return act_scales
@torch.no_grad()
def smooth_gemm_fc1_gate(fc1_weights,
gate_weights,
act_scales,
layernorm_weights=None,
layernorm_bias=None,
alpha=0.5,
weight_scales=None):
gemm_weights = []
if not isinstance(fc1_weights, list):
fc1_weights = [fc1_weights]
if not isinstance(gate_weights, list):
gate_weights = [gate_weights]
for i in range(len(fc1_weights)):
gemm_weight = torch.cat([fc1_weights[i], gate_weights[i]], dim=0)
gemm_weights.append(gemm_weight)
orig_dtype = gemm_weights[0].dtype
for gemm in gemm_weights:
# gemm_weights are expected to be transposed
assert gemm.shape[1] == act_scales.numel()
if weight_scales is None:
weight_scales = torch.cat(
[gemm.abs().max(dim=0, keepdim=True)[0] for gemm in gemm_weights],
dim=0)
weight_scales = weight_scales.max(dim=0)[0]
weight_scales.to(float).clamp(min=1e-5)
scales = (act_scales.to(gemm_weights[0].device).to(float).pow(alpha) /
weight_scales.pow(1 - alpha)).clamp(min=1e-5)
apply_smoothing(scales, fc1_weights + gate_weights, layernorm_weights,
layernorm_bias, orig_dtype)
return scales
@torch.no_grad()
def smooth_model(model, scales, alpha, qkv_para, smoother_dict):
# Smooth the activation and weights with smoother = $\diag{s}$
for name, module in model.named_modules():
if not isinstance(module, LlamaDecoderLayer):
continue
# qkv_proj
layer_name_q = name + ".self_attn.q_proj"
layer_name_k = name + ".self_attn.k_proj"
layer_name_v = name + ".self_attn.v_proj"
layer_name_qkv = name + ".self_attn.qkv_proj"
weight = torch.cat([
module.self_attn.q_proj.weight, module.self_attn.k_proj.weight,
module.self_attn.v_proj.weight
],
dim=0)
smoother = smooth_gemm(weight, scales[layer_name_q]["x"],
module.input_layernorm.weight, None, alpha)
scales[layer_name_qkv]["x"] = scales[layer_name_q]["x"] / smoother
scales[layer_name_qkv]["w"] = weight.abs().max(dim=1)[0]
scales[layer_name_qkv]["y"] = torch.cat([
scales[layer_name_q]["y"], scales[layer_name_k]["y"],
scales[layer_name_v]["y"]
],
dim=0)
# see transpose_weights function
qkv_para[layer_name_qkv] = weight.transpose(0, 1)
# =================================================================
layer_name = name + ".self_attn.o_proj"
smoother = smooth_gemm(module.self_attn.o_proj.weight,
scales[layer_name]["x"], None, None, alpha)
smoother_dict[layer_name] = smoother.float()
scales[layer_name]["x"] = scales[layer_name]["x"] / smoother
scales[layer_name]["w"] = module.self_attn.o_proj.weight.abs().max(
dim=1)[0]
# ==================================================================
fc1_layer_name = name + ".mlp.gate_proj"
gate_layer_name = name + ".mlp.up_proj"
smoother = smooth_gemm_fc1_gate(module.mlp.gate_proj.weight,
module.mlp.up_proj.weight,
scales[fc1_layer_name]["x"],
module.post_attention_layernorm.weight,
None, alpha)
scales[fc1_layer_name]["x"] = scales[fc1_layer_name]["x"] / smoother
scales[fc1_layer_name]["w"] = module.mlp.gate_proj.weight.abs().max(
dim=1)[0]
scales[gate_layer_name]["x"] = scales[gate_layer_name]["x"] / smoother
scales[gate_layer_name]["w"] = module.mlp.up_proj.weight.abs().max(
dim=1)[0]
# ==================================================================
layer_name = name + ".mlp.down_proj"
smoother = smooth_gemm(module.mlp.down_proj.weight,
scales[layer_name]["x"], None, None, alpha)
smoother_dict[layer_name] = smoother.float()
scales[layer_name]["x"] = scales[layer_name]["x"] / smoother
scales[layer_name]["w"] = module.mlp.down_proj.weight.abs().max(
dim=1)[0]
def get_tllm_linear_sq_weight(vals,
prefix,
shape,
tensor_parallel,
is_qkv=False,
per_token=False,
per_channel=False,
last_prefix=None,
bias=None,
smoother_value=None,
smoother_shape=None,
rank=0,
cat_dim=0,
multi_query_mode=False):
results = {}
def multi_query_split(data, local_dim, head_size, tp_size, cur_rank):
q, k, v = np.split(data, [local_dim, local_dim + head_size], axis=-1)
q_split = np.split(q, tp_size, axis=-1)
k_split = np.split(k, tp_size, axis=-1)
v_split = np.split(v, tp_size, axis=-1)
return [
np.concatenate((q_split[ii], k_split[ii], v_split[ii]), axis=-1)
for ii in range(tp_size)
][cur_rank]
col_shape = shape if (is_qkv or per_channel) else [1, 1]
if per_token:
if per_channel:
original_weights = np.array(vals["weight.int8.col"])
else:
original_weights = np.array(vals["weight.int8"])
local_dim = original_weights.shape[0]
head_size = (original_weights.shape[1] - local_dim) // 2
if multi_query_mode:
cur_weights = multi_query_split(original_weights, local_dim,
head_size, tensor_parallel, rank)
else:
cur_weights = np.split(original_weights,
tensor_parallel,
axis=cat_dim)[rank]
if is_qkv:
hidden_dim = cur_weights.shape[0]
cur_weights = cur_weights.reshape(hidden_dim, -1)
results[prefix +
'weight'] = torch.from_numpy(cur_weights).t().contiguous()
if smoother_value is None:
results[last_prefix] = torch.from_numpy(
np.array([1.0], dtype=np.float32))
if per_channel:
cur_per_channel_value = vals["scale_w_quant_orig.col"]
if smoother_value is None:
if multi_query_mode:
cur_per_channel_value = multi_query_split(
vals["scale_w_quant_orig.col"], local_dim, head_size,
tensor_parallel, rank)
else:
cur_per_channel_value = np.split(
vals["scale_w_quant_orig.col"],
tensor_parallel,
axis=cat_dim)[rank]
else:
cur_per_channel_value = vals["scale_w_quant_orig"]
if is_qkv:
if multi_query_mode:
cur_per_channel_value = multi_query_split(
vals["scale_w_quant_orig"], local_dim, head_size,
tensor_parallel, rank)
else:
cur_per_channel_value = np.split(vals["scale_w_quant_orig"],
tensor_parallel,
axis=cat_dim)[rank]
results[prefix + 'per_channel_scale'] = torch.from_numpy(
np.array(cur_per_channel_value,
dtype=np.float32).reshape(col_shape)).contiguous()
else:
if per_channel:
original_weights = np.array(vals["weight.int8.col"])
else:
original_weights = np.array(vals["weight.int8"])
local_dim = original_weights.shape[0]
head_size = (original_weights.shape[1] - local_dim) // 2
if multi_query_mode:
cur_weights = multi_query_split(original_weights, local_dim,
head_size, tensor_parallel, rank)
else:
cur_weights = np.split(original_weights,
tensor_parallel,
axis=cat_dim)[rank]
if is_qkv:
hidden_dim = cur_weights.shape[0]
cur_weights = cur_weights.reshape(hidden_dim, -1)
results[prefix +
'weight'] = torch.from_numpy(cur_weights).t().contiguous()
if per_channel:
cur_per_channel_value = vals["scale_y_accum_quant.col"]
if smoother_value is None:
if multi_query_mode:
cur_per_channel_value = multi_query_split(
vals["scale_y_accum_quant.col"], local_dim, head_size,
tensor_parallel, rank)
else:
cur_per_channel_value = np.split(
vals["scale_y_accum_quant.col"],
tensor_parallel,
axis=cat_dim)[rank]
else:
cur_per_channel_value = vals["scale_y_accum_quant"]
# QKV is always per_channel
if is_qkv:
if multi_query_mode:
cur_per_channel_value = multi_query_split(
vals["scale_y_accum_quant"], local_dim, head_size,
tensor_parallel, rank)
else:
cur_per_channel_value = np.split(
vals["scale_y_accum_quant"],
tensor_parallel,
axis=cat_dim)[rank]
results[prefix + 'per_channel_scale'] = torch.from_numpy(
np.array([cur_per_channel_value],
dtype=np.float32).reshape(col_shape)).contiguous()
results[last_prefix] = torch.from_numpy(
np.array([vals['scale_x_orig_quant']],
dtype=np.float32)).contiguous()
results[prefix + 'act_scale'] = torch.from_numpy(
np.array([[vals["scale_y_quant_orig"]]],
dtype=np.float32)).contiguous()
if smoother_value is not None:
cur_smoother_value = np.split(smoother_value,
tensor_parallel,
axis=cat_dim)[rank]
results[prefix + 'smoother'] = cur_smoother_value.reshape(
smoother_shape).contiguous().to(torch.float32)
if bias is not None:
results[prefix + 'bias'] = bias
return results
def split(weight: torch.Tensor,
tp_size: int,
rank: int = 0,
dim: int = 0) -> torch.Tensor:
if tp_size == 1:
return weight
elif weight.ndim == 1:
return torch.chunk(weight, tp_size)[rank].contiguous()
else:
return torch.chunk(weight, tp_size, dim=dim)[rank].contiguous()
def split_qkv_tp(qkv, n_head, n_kv_heads, head_size, tensor_parallel, rank):
"""
Splits the QKV matrix according to tensor parallelism
"""
kv_head_size = n_kv_heads * head_size
q, k, v = torch.split(qkv, [n_head * head_size, kv_head_size, kv_head_size],
dim=0)
q = split(q, tensor_parallel, rank, dim=0)
k = split(k, tensor_parallel, rank, dim=0)
v = split(v, tensor_parallel, rank, dim=0)
return torch.concatenate([q, k, v], dim=0).contiguous()
def split_matrix_tp(weight: torch.Tensor, tp_size: int, rank: int,
dim: int) -> torch.Tensor:
return split(weight, tp_size, rank, dim=dim)
def get_weight(params: Dict[str, torch.Tensor], prefix: str,
dtype: torch.dtype) -> torch.Tensor:
if f'{prefix}.weight' not in params:
return None
return params[f'{prefix}.weight'].to(dtype).detach().cpu()
def get_bias(params: Dict[str, torch.Tensor], prefix: str,
dtype: torch.dtype) -> torch.Tensor:
if f'{prefix}.bias' not in params:
return None
return params[f'{prefix}.bias'].to(dtype).detach().cpu()
def get_weight_and_bias(params: Dict[str, torch.Tensor], prefix: str,
dtype: torch.dtype) -> Tuple[torch.Tensor]:
return get_weight(params, prefix, dtype), get_bias(params, prefix, dtype)
def get_tllm_linear_weight(
weight: torch.Tensor,
prefix: str,
bias: Optional[torch.Tensor] = None,
use_weight_only: bool = False,
plugin_weight_only_quant_type: torch.dtype = torch.int8
) -> Dict[str, torch.Tensor]:
results = {}
if use_weight_only:
v = weight.t().contiguous()
processed_torch_weights, torch_weight_scales = \
torch.ops.trtllm.symmetric_quantize_last_axis_of_batched_matrix(
v, plugin_weight_only_quant_type)
results[f'{prefix}weight'] = processed_torch_weights
results[f'{prefix}per_channel_scale'] = torch_weight_scales
else:
results[f'{prefix}weight'] = weight.contiguous()
if bias is not None:
results[f'{prefix}bias'] = bias
return results
class LlamaAttentionExtend(LlamaAttention):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.head_dim = self.config.head_size
self.q_proj = nn.Linear(self.hidden_size,
self.num_heads * self.head_dim,
bias=False)
self.k_proj = nn.Linear(self.hidden_size,
self.num_key_value_heads * self.head_dim,
bias=False)
self.v_proj = nn.Linear(self.hidden_size,
self.num_key_value_heads * self.head_dim,
bias=False)
self.o_proj = nn.Linear(self.num_heads * self.head_dim,
self.hidden_size,
bias=False)
self._init_rope()
def forward(
self,
hidden_states: torch.Tensor,
attention_mask: Optional[torch.Tensor] = None,
position_ids: Optional[torch.LongTensor] = None,
past_key_value: Optional[Cache] = None,
output_attentions: bool = False,
use_cache: bool = False,
cache_position: Optional[torch.LongTensor] = None,
**kwargs,
) -> Tuple[torch.Tensor, Optional[torch.Tensor],
Optional[Tuple[torch.Tensor]]]:
bsz, q_len, _ = hidden_states.size()
if self.config.pretraining_tp > 1:
key_value_slicing = (self.num_key_value_heads *
self.head_dim) // self.config.pretraining_tp
query_slices = self.q_proj.weight.split(
(self.num_heads * self.head_dim) // self.config.pretraining_tp,
dim=0)
key_slices = self.k_proj.weight.split(key_value_slicing, dim=0)
value_slices = self.v_proj.weight.split(key_value_slicing, dim=0)
query_states = [
F.linear(hidden_states, query_slices[i])
for i in range(self.config.pretraining_tp)
]
query_states = torch.cat(query_states, dim=-1)
key_states = [
F.linear(hidden_states, key_slices[i])
for i in range(self.config.pretraining_tp)
]
key_states = torch.cat(key_states, dim=-1)
value_states = [
F.linear(hidden_states, value_slices[i])
for i in range(self.config.pretraining_tp)
]
value_states = torch.cat(value_states, dim=-1)
else:
query_states = self.q_proj(hidden_states)
key_states = self.k_proj(hidden_states)
value_states = self.v_proj(hidden_states)
query_states = query_states.view(bsz, q_len, self.num_heads,
self.head_dim).transpose(1, 2)
key_states = key_states.view(bsz, q_len, self.num_key_value_heads,
self.head_dim).transpose(1, 2)
value_states = value_states.view(bsz, q_len, self.num_key_value_heads,
self.head_dim).transpose(1, 2)
past_key_value = getattr(self, "past_key_value", past_key_value)
cos, sin = self.rotary_emb(value_states, position_ids)
query_states, key_states = apply_rotary_pos_emb(query_states,
key_states, cos, sin)
if past_key_value is not None:
# sin and cos are specific to RoPE models; position_ids needed for the static cache
cache_kwargs = {
"sin": sin,
"cos": cos,
"cache_position": cache_position
}
key_states, value_states = past_key_value.update(
key_states, value_states, self.layer_idx, cache_kwargs)
key_states = repeat_kv(key_states, self.num_key_value_groups)
value_states = repeat_kv(value_states, self.num_key_value_groups)
attn_weights = torch.matmul(query_states, key_states.transpose(
2, 3)) / math.sqrt(self.head_dim)
if attention_mask is not None: # no matter the length, we just slice it
if cache_position is not None:
causal_mask = attention_mask[:, :, cache_position, :key_states.
shape[-2]]
attn_weights = attn_weights + causal_mask
# upcast attention to fp32
attn_weights = nn.functional.softmax(attn_weights,
dim=-1,
dtype=torch.float32).to(
query_states.dtype)
attn_weights = nn.functional.dropout(attn_weights,
p=self.attention_dropout,
training=self.training)
attn_output = torch.matmul(attn_weights, value_states)
if attn_output.size() != (bsz, self.num_heads, q_len, self.head_dim):
raise ValueError(
f"`attn_output` should be of size {(bsz, self.num_heads, q_len, self.head_dim)}, but is"
f" {attn_output.size()}")
attn_output = attn_output.transpose(1, 2).contiguous()
# Here is what we extend.
attn_output = attn_output.reshape(bsz, q_len,
self.num_heads * self.head_dim)
if self.config.pretraining_tp > 1:
attn_output = attn_output.split(self.hidden_size //
self.config.pretraining_tp,
dim=2)
o_proj_slices = self.o_proj.weight.split(self.hidden_size //
self.config.pretraining_tp,
dim=1)
attn_output = sum([
F.linear(attn_output[i], o_proj_slices[i])
for i in range(self.config.pretraining_tp)
])
else:
attn_output = self.o_proj(attn_output)
if not output_attentions:
attn_weights = None
return attn_output, attn_weights, past_key_value
def create_model_from_config(trt_llm_config, weights):
model_config = LlamaConfig()
model_config.vocab_size = trt_llm_config.vocab_size
model_config.dtype = trt_llm_config.dtype
model_config.max_position_embeddings = trt_llm_config.max_position_embeddings
model_config.hidden_size = trt_llm_config.hidden_size
model_config.num_hidden_layers = trt_llm_config.num_hidden_layers
model_config.num_attention_heads = trt_llm_config.num_attention_heads
model_config.num_key_value_heads = trt_llm_config.num_key_value_heads
model_config.hidden_act = trt_llm_config.hidden_act
model_config.head_size = trt_llm_config.head_size
model_config.intermediate_size = trt_llm_config.intermediate_size
model = LlamaForCausalLM(model_config)
# Hack attention module since head_dim * num_heads > hidden_size for 7B.
for i in range(model_config.num_hidden_layers):
module = model.model.layers[i].self_attn
model.model.layers[i].self_attn = LlamaAttentionExtend(
module.config, module.layer_idx)
# Copy wegiht to LLAMA model.
replace_name_dict = {
'attention.dense': 'self_attn.o_proj',
'mlp.proj': 'mlp.down_proj',
'mlp.gate': 'mlp.up_proj',
'mlp.fc': 'mlp.gate_proj',
'ln_f': 'norm',
'post_layernorm': 'post_attention_layernorm',
'vocab_embedding': 'embed_tokens',
}
for name in list(weights):
param = weights[name]
weights.pop(name)
new_name = name.replace('transformer', 'model')
for _name in replace_name_dict:
if _name in new_name:
new_name = new_name.replace(_name, replace_name_dict[_name])
if 'attention.qkv' in name:
qw, kw, vw = torch.split(param, [
model_config.num_attention_heads * model_config.head_size,
model_config.num_key_value_heads * model_config.head_size,
model_config.num_key_value_heads * model_config.head_size,
],
dim=0)
weights[new_name.replace('attention.qkv', 'self_attn.q_proj')] = qw
weights[new_name.replace('attention.qkv', 'self_attn.k_proj')] = kw
weights[new_name.replace('attention.qkv', 'self_attn.v_proj')] = vw
else:
weights[new_name] = param
if "lm_head.weight" not in weights:
weights["lm_head.weight"] = weights["model.embed_tokens.weight"].clone()
model.load_state_dict(weights)
return model
def convert_hf_model(hf_model,
mapping,
vocab_size=32000,
dtype='float32',
use_parallel_embedding=False,
sharding_dim=0,
use_weight_only=False,
plugin_weight_only_quant_type=torch.int8,
use_smooth_quant=False,
per_channel=False,
per_token=False,
int8_kv_cache=False,
act_range=[],
qkv_para=[],
smoother=[]):
weights = {}
tik = time.time()
tensor_parallel = mapping.tp_size
model_params = dict(hf_model.named_parameters())
dtype = getattr(torch, dtype)
num_attention_heads = hf_model.config.num_attention_heads
hidden_size = hf_model.config.hidden_size
intermediate_size = hf_model.config.intermediate_size
head_size = hf_model.config.head_size
num_key_value_heads = hf_model.config.num_key_value_heads
mha_mode = (num_key_value_heads == num_attention_heads)
num_hidden_layers = hf_model.config.num_hidden_layers
layers_range = mapping.pp_layers(num_hidden_layers)
for l in layers_range:
print("Processing layer", l)
prefix = f'model.layers.{l}.'
layer_idx = int(l) - layers_range[0]
tllm_prex = f'transformer.layers.{layer_idx}.'
if use_smooth_quant:
qkv_weight = qkv_para[prefix + 'self_attn.qkv_proj']
qkv_out_dim = qkv_weight.shape[1]
if not mha_mode:
hidden_size = qkv_weight.shape[0]
local_dim = hidden_size
head_size = (qkv_weight.shape[-1] - local_dim) // 2
qkv_weight = qkv_weight.reshape(hidden_size,
local_dim + 2 * head_size)
else:
qkv_weight = qkv_weight.reshape(hidden_size, 3,
head_size * num_attention_heads)
int8_weights = generate_int8(qkv_weight,
act_range.get(prefix +
'self_attn.qkv_proj'),
is_qkv=True,
multi_query_mode=bool(not mha_mode))
weights.update(
get_tllm_linear_sq_weight(int8_weights,
tllm_prex + 'attention.qkv.',
[1, qkv_out_dim // tensor_parallel],
tensor_parallel,
is_qkv=True,
per_token=per_token,
per_channel=per_channel,
last_prefix=tllm_prex +
'input_layernorm.scale_to_int',
smoother_value=None,
smoother_shape=None,
rank=mapping.tp_rank,
cat_dim=-1,
multi_query_mode=bool(not mha_mode)))
else:
q_weight = get_weight(model_params, prefix + 'self_attn.q_proj',
dtype)
k_weight = get_weight(model_params, prefix + 'self_attn.k_proj',
dtype)
v_weight = get_weight(model_params, prefix + 'self_attn.v_proj',
dtype)
if not mha_mode:
if num_key_value_heads < tensor_parallel:
# duplicate the KV heads up to tensor_parallel
k_weight = dup_kv_weight(k_weight, num_key_value_heads,
tensor_parallel)
v_weight = dup_kv_weight(v_weight, num_key_value_heads,
tensor_parallel)
assert (k_weight.shape[0] % (mapping.tp_size * head_size)) == 0
assert (v_weight.shape[0] % (mapping.tp_size * head_size)) == 0
wq = split(q_weight, mapping.tp_size, mapping.tp_rank)
wk = split(k_weight, mapping.tp_size, mapping.tp_rank)
wv = split(v_weight, mapping.tp_size, mapping.tp_rank)
split_v = torch.concat((wq, wk, wv))
else:
qkv_weight = torch.cat([q_weight, k_weight, v_weight], dim=0)
split_v = split_qkv_tp(qkv_weight, num_attention_heads,
num_key_value_heads, head_size,
tensor_parallel, mapping.tp_rank)
weights.update(
get_tllm_linear_weight(split_v, tllm_prex + 'attention.qkv.',
None, use_weight_only,
plugin_weight_only_quant_type))
if int8_kv_cache:
qkv_y = torch.cat([
act_range.get(prefix + 'self_attn.q_proj')["y"],
act_range.get(prefix + 'self_attn.k_proj')["y"],
act_range.get(prefix + 'self_attn.v_proj')["y"]
],
dim=0)
int8_kv_scales = qkv_y.max() / 127.
kv_cache_weights = {}
kv_cache_weights[
tllm_prex +
'attention.kv_cache_scaling_factor'] = int8_kv_scales.reshape(
[1])
weights.update(kv_cache_weights)
# Attention dense.
attn_dense_weight = get_weight(model_params,
prefix + 'self_attn.o_proj', dtype)
if use_smooth_quant:
attn_dense_weight = attn_dense_weight.t()
int8_weights = generate_int8(
attn_dense_weight, act_range.get(prefix + 'self_attn.o_proj'))
weights.update(
get_tllm_linear_sq_weight(
int8_weights,
tllm_prex + 'attention.dense.', [1, hidden_size],
tensor_parallel,
is_qkv=False,
per_token=per_token,
per_channel=per_channel,
last_prefix=tllm_prex +
'attention.quantization_scaling_factor',
smoother_value=smoother[(prefix + 'self_attn.o_proj')],
smoother_shape=[
1, head_size * num_attention_heads // tensor_parallel
],
rank=mapping.tp_rank,
cat_dim=0))
else:
attn_dense_weight = split_matrix_tp(attn_dense_weight,
tensor_parallel,
mapping.tp_rank,
dim=1)
weights.update(
get_tllm_linear_weight(attn_dense_weight,
tllm_prex + 'attention.dense.', None,
use_weight_only,
plugin_weight_only_quant_type))
# MLP hf up to trt gate
mlp_up_weight = get_weight(model_params, prefix + 'mlp.up_proj', dtype)
if use_smooth_quant:
mlp_up_weight = mlp_up_weight.t()
int8_weights = generate_int8(mlp_up_weight,
act_range.get(prefix + 'mlp.up_proj'))
weights.update(
get_tllm_linear_sq_weight(
int8_weights,
tllm_prex + 'mlp.gate.',
[1, intermediate_size // tensor_parallel],
tensor_parallel,
is_qkv=False,
per_token=per_token,
per_channel=per_channel,
last_prefix=tllm_prex + 'post_layernorm.scale_to_int',
smoother_value=None,
smoother_shape=None,
rank=mapping.tp_rank,
cat_dim=-1))
else:
mlp_up_weight = split_matrix_tp(mlp_up_weight,
tensor_parallel,
mapping.tp_rank,
dim=0)
weights.update(
get_tllm_linear_weight(mlp_up_weight, tllm_prex + 'mlp.gate.',
None, use_weight_only,
plugin_weight_only_quant_type))
# MLP trt Gate to mlp fc
mlp_gate_weight = get_weight(model_params, prefix + 'mlp.gate_proj',
dtype)
if use_smooth_quant:
mlp_gate_weight = mlp_gate_weight.t()
int8_weights = generate_int8(
mlp_gate_weight, act_range.get(prefix + 'mlp.gate_proj'))
weights.update(
get_tllm_linear_sq_weight(
int8_weights,
tllm_prex + 'mlp.fc.',
[1, intermediate_size // tensor_parallel],
tensor_parallel,
is_qkv=False,
per_token=per_token,
per_channel=per_channel,
last_prefix=tllm_prex + 'post_layernorm.scale_to_int',
smoother_value=None,
smoother_shape=None,
rank=mapping.tp_rank,
cat_dim=-1))
else:
mlp_gate_weight = split_matrix_tp(mlp_gate_weight,
tensor_parallel,
mapping.tp_rank,
dim=0)
weights.update(
get_tllm_linear_weight(mlp_gate_weight, tllm_prex + 'mlp.fc.',
None, use_weight_only,
plugin_weight_only_quant_type))
# MLP down
mlp_proj_weight = get_weight(model_params, prefix + 'mlp.down_proj',
dtype)
if use_smooth_quant:
mlp_proj_weight = mlp_proj_weight.t()
int8_weights = generate_int8(
mlp_proj_weight, act_range.get(prefix + 'mlp.down_proj'))
weights.update(
get_tllm_linear_sq_weight(
int8_weights,
tllm_prex + 'mlp.proj.', [1, hidden_size],
tensor_parallel,
is_qkv=False,
per_token=per_token,
per_channel=per_channel,
last_prefix=tllm_prex + 'mlp.quantization_scaling_factor',
smoother_value=smoother[prefix + 'mlp.down_proj'],
smoother_shape=[1, intermediate_size // tensor_parallel],
rank=mapping.tp_rank,
cat_dim=0))
else:
mlp_proj_weight = split_matrix_tp(mlp_proj_weight,
tensor_parallel,
mapping.tp_rank,
dim=1)
weights.update(
get_tllm_linear_weight(mlp_proj_weight, tllm_prex + 'mlp.proj.',
None, use_weight_only,
plugin_weight_only_quant_type))
# Layer norms do not use tensor parallelism
input_ln_weight = get_weight(model_params, prefix + 'input_layernorm',
dtype)
weights[tllm_prex + 'input_layernorm.weight'] = input_ln_weight
post_ln_weight = get_weight(model_params,
prefix + 'post_attention_layernorm', dtype)
weights[tllm_prex + 'post_layernorm.weight'] = post_ln_weight
v = get_weight(model_params, 'model.embed_tokens', dtype)
if use_parallel_embedding:
v = split_matrix_tp(v,
mapping.tp_size,
mapping.tp_rank,
dim=sharding_dim)
if mapping.is_first_pp_rank():
weights['transformer.vocab_embedding.weight'] = v
lm_head_weights = get_weight(model_params, 'lm_head', dtype)
if mapping.is_last_pp_rank():
if vocab_size % mapping.tp_size != 0:
# padding
vocab_size_padded = pad_vocab_size(vocab_size, mapping.tp_size)
pad_width = vocab_size_padded - vocab_size
lm_head_weights = torch.from_numpy(
np.pad(lm_head_weights.detach().cpu().numpy(),
((0, pad_width), (0, 0)),
'constant',
constant_values=0))
weights['lm_head.weight'] = split_matrix_tp(lm_head_weights,
tensor_parallel,
mapping.tp_rank,
dim=0)
ln_f_w = get_weight(model_params, 'model.norm', dtype)
weights['transformer.ln_f.weight'] = ln_f_w
tok = time.time()
t = time.strftime('%H:%M:%S', time.gmtime(tok - tik))
print(f'Weights loaded. Total time: {t}')
return weights
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