Merge 655d4705eb into 7a9137d2e9

[perf] skip the per-forward RoPE buffer broadcast in the RL trainers

scripts/eval_toolcall.py

@@ -12,7 +12,7 @@ from datetime import datetime
 from transformers import AutoTokenizer, AutoModelForCausalLM, TextStreamer
 from openai import OpenAI
 from model.model_minimind import MiniMindConfig, MiniMindForCausalLM
-from trainer.trainer_utils import setup_seed, get_model_params
+from trainer.trainer_utils import setup_seed, get_model_params, safe_math_eval
 warnings.filterwarnings('ignore')
 
 TOOLS = [
@@ -27,7 +27,7 @@ TOOLS = [
 ]
 
 MOCK_RESULTS = {
-    "calculate_math": lambda args: {"result": str(eval(str(args.get("expression", "0")).replace("^", "**").replace("×", "*").replace("÷", "/").replace("−", "-").replace("²", "**2").replace("³", "**3").replace("（", "(").replace("）", ")")))},
+    "calculate_math": lambda args: {"result": str(safe_math_eval(args.get("expression", "0")))},
     "get_current_time": lambda args: {"datetime": datetime.now().strftime("%Y-%m-%d %H:%M:%S"), "timezone": args.get("timezone", "Asia/Shanghai")},
     "random_number": lambda args: {"result": random.randint(int(args.get("min", 0)), int(args.get("max", 100)))},
     "text_length": lambda args: {"characters": len(args.get("text", "")), "words": len(args.get("text", "").split())},

scripts/web_demo.py

@@ -2,6 +2,7 @@ import random
 import re
 import json
 import os
+import sys
 from threading import Thread
 
 import torch
@@ -9,6 +10,9 @@ import numpy as np
 import streamlit as st
 from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStreamer
 
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+from trainer.trainer_utils import safe_math_eval
+
 st.set_page_config(page_title="MiniMind", initial_sidebar_state="collapsed")
 
 st.markdown("""
@@ -125,7 +129,7 @@ def execute_tool(tool_name, args):
     import datetime
     try:
         if tool_name == 'calculate_math':
-            return {"result": eval(args.get('expression', '0'))}
+            return {"result": safe_math_eval(args.get('expression', '0'))}
         elif tool_name == 'get_current_time':
             tz = args.get('timezone', 'Asia/Shanghai')
             return {"result": datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')}

trainer/train_agent.py

@@ -10,7 +10,6 @@ import gc
 import json
 import math
 import random
-import signal
 import argparse
 import warnings
 import torch
@@ -24,7 +23,7 @@ from torch.optim.lr_scheduler import CosineAnnealingLR
 from transformers import AutoTokenizer
 from model.model_minimind import MiniMindConfig, MiniMindForCausalLM
 from dataset.lm_dataset import AgentRLDataset
-from trainer.trainer_utils import Logger, is_main_process, lm_checkpoint, init_distributed_mode, setup_seed, SkipBatchSampler, init_model, LMForRewardModel
+from trainer.trainer_utils import Logger, is_main_process, lm_checkpoint, init_distributed_mode, setup_seed, SkipBatchSampler, init_model, LMForRewardModel, safe_math_eval
 from trainer.rollout_engine import create_rollout_engine, compute_per_token_logps
 
 warnings.filterwarnings('ignore')
@@ -55,7 +54,7 @@ UNIT_DATA = {"km_miles": 0.621371, "miles_km": 1.60934, "kg_pounds": 2.20462, "p
 
 # ======== 模拟执行 ========
 MOCK_RESULTS = {
-    "calculate_math": lambda args: {"result": str(eval(str(args.get("expression", "0")).replace("^", "**").replace("×", "*").replace("÷", "/").replace("−", "-").replace("（", "(").replace("）", ")"), {"__builtins__": {}, "math": math}))},
+    "calculate_math": lambda args: {"result": str(safe_math_eval(args.get("expression", "0")))},
     "unit_converter": lambda args: {"result": round(float(args.get("value", 0)) * UNIT_DATA.get(f"{args.get('from_unit', '').lower()}_{args.get('to_unit', '').lower()}", 1), 4)},
     "get_current_weather": lambda args: (lambda w: {"city": args.get("location"), "temperature": w[0], "humidity": "65%", "condition": w[1]})(WEATHER_DATA.get(args.get("location"), ("22°C", "晴"))),
     "get_current_time": lambda args: {"datetime": TIME_DATA.get(args.get("timezone", "Asia/Shanghai"), "2025-03-07 14:30:00"), "timezone": args.get("timezone", "Asia/Shanghai")},
@@ -85,14 +84,9 @@ def execute_tool(name, args):
     fn = MOCK_RESULTS.get(name)
     if not fn: return None
     try:
-        signal.signal(signal.SIGALRM, lambda *_: (_ for _ in ()).throw(TimeoutError()))
-        signal.alarm(1)
         return fn(args)
-    except:
+    except Exception:
         return None
-    finally:
-        try: signal.alarm(0)
-        except: pass
 
 # ======== 多轮 Rollout ========
 def rollout_single(rollout_engine, tokenizer, messages, tools, max_turns=3, max_new_tokens=256, thinking_ratio=0.5, device="cuda"):
@@ -479,7 +473,8 @@ if __name__ == "__main__":
         Logger('torch.compile enabled')
         rollout_engine.update_policy(model)
     if dist.is_initialized():
-        model = DistributedDataParallel(model, device_ids=[local_rank])
+        # 同 train_ppo：RoPE buffer 各 rank 一致，每步广播纯属浪费
+        model = DistributedDataParallel(model, device_ids=[local_rank], broadcast_buffers=False)
     rollout_engine.update_policy(model)
 
     for epoch in range(start_epoch, args.epochs):

trainer/train_grpo.py

@@ -314,7 +314,8 @@ if __name__ == "__main__":
         Logger('torch.compile enabled')
         rollout_engine.update_policy(model)
     if dist.is_initialized():
-        model = DistributedDataParallel(model, device_ids=[local_rank])
+        # 同 train_ppo：RoPE buffer 各 rank 一致，每步广播纯属浪费
+        model = DistributedDataParallel(model, device_ids=[local_rank], broadcast_buffers=False)
     rollout_engine.update_policy(model)
     
     # ========== 8. 开始训练 ==========

trainer/train_ppo.py

@@ -36,7 +36,7 @@ def rep_penalty(text, n=3, cap=0.5):
 class CriticModel(MiniMindForCausalLM):
     def __init__(self, params):
         super().__init__(params)
-        # 替换lm_head为输出单一价值的线性层
+        # lm_head 不参与 forward，仅靠 tie_word_embeddings 与 embed_tokens 共享权重，解绑后 DDP 会报未使用参数
         self.value_head = nn.Linear(params.hidden_size, 1)
 
     def forward(self, input_ids=None, attention_mask=None, **kwargs):
@@ -429,8 +429,9 @@ if __name__ == "__main__":
         Logger('torch.compile enabled')
         rollout_engine.update_policy(actor_model)
     if dist.is_initialized():
-        actor_model = DistributedDataParallel(actor_model, device_ids=[local_rank])
+        # freqs_cos/freqs_sin 各 rank 由 config 确定性算出，默认每步广播一次纯属浪费
-        critic_model = DistributedDataParallel(critic_model, device_ids=[local_rank])
+        actor_model = DistributedDataParallel(actor_model, device_ids=[local_rank], broadcast_buffers=False)
+        critic_model = DistributedDataParallel(critic_model, device_ids=[local_rank], broadcast_buffers=False)
     rollout_engine.update_policy(actor_model)
     
     # ========== 8. 开始训练 ==========

trainer/trainer_utils.py

@@ -5,6 +5,8 @@ import os
 import sys
 __package__ = "trainer"
 sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+import ast
+import operator
 import random
 import math
 import numpy as np
@@ -175,3 +177,33 @@ class LMForRewardModel:
         ]
         score = self.model.get_score(self.tokenizer, eval_messages)
         return max(min(score, 3.0), -3.0)
+
+
+# ===== 数学表达式安全求值：替代 eval，只放行算术运算与 math 白名单（长度上限 512） =====
+def safe_math_eval(expression):
+    """对模型生成的数学表达式求值：支持 + - * / // % **、math 白名单函数与 pi/e/tau 常量。"""
+    def pow_guard(base, exp):  # 幂运算统一走这里，拦截 9**9**9 / 10**99999 这类把进程算死的输入
+        if abs(exp) > 1e4 or (abs(base) > 1 and abs(exp) * math.log10(abs(base)) > 100): raise ValueError('幂运算结果过大')
+        return base ** exp
+    def resolve(node):  # 同时兼容 sqrt(4) 与 math.sqrt(4) 两种写法
+        if isinstance(node, ast.Name): return node.id
+        if isinstance(node, ast.Attribute) and getattr(node.value, 'id', '') == 'math': return node.attr
+    def walk(node):
+        if isinstance(node, ast.Constant) and type(node.value) in (int, float): return node.value
+        name = resolve(node)
+        if name in consts: return consts[name]
+        if isinstance(node, ast.UnaryOp): return unary_ops[type(node.op)](walk(node.operand))
+        if isinstance(node, ast.BinOp): return bin_ops[type(node.op)](walk(node.left), walk(node.right))
+        if isinstance(node, ast.Call) and not node.keywords: return funcs[resolve(node.func)](*map(walk, node.args))
+        raise ValueError(f'不支持的表达式语法: {type(node).__name__}')
+    consts = {'pi': math.pi, 'e': math.e, 'tau': math.tau}
+    funcs = {'pow': pow_guard, **{n: getattr(math, n) for n in 'sqrt exp log log2 log10 sin cos tan asin acos atan atan2 sinh cosh tanh floor ceil trunc fabs fmod hypot gcd degrees radians'.split()}}
+    bin_ops = {ast.Add: operator.add, ast.Sub: operator.sub, ast.Mult: operator.mul, ast.Div: operator.truediv, ast.FloorDiv: operator.floordiv, ast.Mod: operator.mod, ast.Pow: pow_guard}
+    unary_ops = {ast.UAdd: operator.pos, ast.USub: operator.neg}
+    chars = str.maketrans({'^': '**', '×': '*', '÷': '/', '−': '-', '²': '**2', '³': '**3', '（': '(', '）': ')'})
+    expr = str(expression).translate(chars).strip()
+    if not expr or len(expr) > 512: raise ValueError('表达式为空或过长')
+    try:
+        return walk(ast.parse(expr, mode='eval').body)
+    except (KeyError, SyntaxError, TypeError):
+        raise ValueError('不支持的表达式语法') from None