[LLM] Add expert parallel

[DrownFish19]

PR types

New features

PR changes

APIs

Description

Add expert parallel

• added in Qwen2Moe

1. 精度验证代码：

import paddle
from paddlenlp.transformers.qwen2_moe.modeling import Qwen2MoeSparseMoEBlock, Qwen2MoeSparseMoEBlock_OLD

from paddlenlp.transformers import Qwen2MoeConfig

config = Qwen2MoeConfig.from_pretrained("Qwen/Qwen2-57B-A14B")
paddle.set_default_dtype(paddle.float32)

with paddle.amp.auto_cast(True):
    block = Qwen2MoeSparseMoEBlock(config)
    block_old = Qwen2MoeSparseMoEBlock_OLD(config)

state_dict = block.state_dict()
block_old.set_state_dict(state_dict)

for seq_len in [i * 1024 for i in range(1, 128)]:
    hidden_state = paddle.rand([1, 1024, config.hidden_size], dtype=paddle.float32).cast(paddle.get_default_dtype())

    block_output = block(hidden_state)
    block_output_old = block_old(hidden_state)

    print(seq_len, ": ", float(paddle.max(paddle.abs(block_output[0] - block_output_old[0]))))

2. 精度验证结果：

同Qwen2Moe原始Moe计算代码（没有专家并行）比较，序列长度计算1k-128k，最大diff保持不变。

float32 diff: 0.0
float16 diff: 1e-4
bfloat16 diff: 9e-4

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 50.27473% with 181 lines in your changes missing coverage. Please review.

Project coverage is 52.89%. Comparing base (b5e3f0c) to head (358483b).
Report is 21 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/transformers/moe_gate.py	42.29%	131 Missing ⚠️
paddlenlp/transformers/moe_layer.py	54.62%	49 Missing ⚠️
paddlenlp/transformers/qwen2_moe/modeling.py	95.83%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9368      +/-   ##
===========================================
- Coverage    53.01%   52.89%   -0.12%     
===========================================
  Files          678      678              
  Lines       108787   108249     -538     
===========================================
- Hits         57668    57262     -406     
+ Misses       51119    50987     -132     

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[wawltor]

LGTM