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大模型开发入门第五讲:Python 容器数据类型!

  • 2026-03-26 09:17:14
大模型开发入门第五讲:Python 容器数据类型!
上一篇我们学会了用流程控制让代码 “动起来”,今天要攻克的容器数据类型,是处理大模型海量训练数据的核心武器!大模型需要批量存储参数、训练样本、配置信息,单靠普通变量根本不够用,而列表、元组、字典、集合这 4 种容器,就像不同功能的 “数据仓库”,能高效管理和操作数据,为后续模型训练、数据清洗打下坚实基础

一、列表(List):有序可变的 “数据清单”

列表是最常用的容器,用 [] 定义,有序、可修改、可重复,特别适合存储大模型的训练日志、损失值序列、批量样本等。

1. 基础定义与访问

# 存储大模型5轮训练的损失值(有序,可修改)loss_list = [0.32, 0.28, 0.25, 0.22, 0.19]# 访问元素:索引从0开始print("第1轮损失值:", loss_list[0])   # 输出:0.32print("最后1轮损失值:", loss_list[-1]) # 输出:0.19# 切片:获取前3轮损失值print("前3轮损失值:", loss_list[:3])   # 输出:[0.320.280.25]

2. 常用操作(大模型开发高频)

loss_list = [0.32, 0.28, 0.25]# 1. 添加元素:追加第4轮损失值loss_list.append(0.22)print("添加后:", loss_list)  # 输出:[0.320.280.250.22]# 2. 修改元素:修正第2轮损失值loss_list[1] = 0.27print("修改后:", loss_list)  # 输出:[0.320.270.250.22]# 3. 删除元素:移除异常数据loss_list.remove(0.32)print("删除后:", loss_list)  # 输出:[0.270.250.22]# 4. 遍历列表:计算平均损失total_loss = 0for loss in loss_list:    total_loss += lossavg_loss = total_loss / len(loss_list)print("平均损失:", avg_loss)  # 输出:0.24666666666666667
大模型场景:存储多轮训练的损失值、准确率,用于可视化分析模型收敛趋势。
二、元组(Tuple):有序不可变的 “只读清单”
元组用 () 定义,有序、不可修改、可重复,适合存储固定不变的配置信息(比如模型输入维度、固定超参数)。
1. 基础定义与访问
# 存储大模型输入维度(不可修改,防止误操作)input_shape = (512768)  # 序列长度512,隐藏维度768# 访问元素print("序列长度:", input_shape[0])  # 输出:512print("隐藏维度:", input_shape[1])  # 输出:768
2. 核心特性:不可修改
input_shape = (512768)# 尝试修改会报错!# input_shape[0] = 1024  # TypeError: 'tuple' object does not support item assignment
大模型场景:存储模型固定参数(如输入维度、类别数),避免代码误改导致训练崩溃。

三、字典(Dict):键值对的 “配置表”

字典用 {} 定义,键唯一、值可修改,是大模型开发中最核心的容器 —— 专门用来存储模型配置、参数映射、样本标签等结构化数据。

1. 基础定义与访问

# 大模型核心配置字典(键=参数名,值=参数值)llm_config = {    "model_name""Python-LLM-Base",    "learning_rate"0.001,    "batch_size"64,    "train_epochs"100,    "is_finetune"True}# 访问值:通过键名获取print("模型名称:", llm_config["model_name"])  # 输出:Python-LLM-Baseprint("学习率:", llm_config.get("learning_rate"))  # 更安全的获取方式
大模型场景:存储模型超参数、数据集路径、训练策略,是配置文件和参数传递的首选。

四、集合(Set):无序唯一的 “去重工具”

集合用 {} 或 set() 定义,无序、元素唯一、不可重复,适合数据清洗中的去重、交集 / 并集计算。

1. 基础定义与去重

# 模拟训练数据中重复的样本IDsample_ids = [101, 102, 101, 103, 102, 104]# 转成集合自动去重unique_ids = set(sample_ids)print("去重后样本ID:", unique_ids)  # 输出:{101102103104}
2. 集合运算(数据筛选)
# 训练集样本IDtrain_ids = {101102103104}# 测试集样本IDtest_ids = {103104105106}# 交集:同时出现在训练集和测试集的样本(需剔除)common_ids = train_ids & test_idsprint("重复样本ID:", common_ids)  # 输出:{103104}# 并集:所有样本IDall_ids = train_ids | test_idsprint("所有样本ID:", all_ids)  # 输出:{101102103104105106}
大模型场景:数据清洗阶段去重样本、筛选训练 / 测试集不重叠数据。
五、容器类型对比与选型指南
容器类型
定义符号
有序性
可修改性
元素唯一性
大模型典型场景
列表(List)
[]
✅ 有序
✅ 可修改
❌ 可重复
存储损失值、训练日志、批量样本
元组(Tuple)
()
✅ 有序
❌ 不可修改
❌ 可重复
存储固定配置(输入维度、类别数)
字典(Dict)
{}
❌ 无序
✅ 可修改
✅ 键唯一
存储模型配置、参数映射、标签信息
集合(Set)
{}
/set()
❌ 无序
✅ 可修改
✅ 元素唯一
数据去重、集合运算(筛选数据)
六、实战案例:大模型数据处理综合演练
"""实战案例:大模型训练数据预处理功能:1. 用字典存储模型配置2. 用列表存储训练损失值3. 用集合去重样本ID4. 用元组固定输入维度"""# 1. 固定配置(元组)input_shape = (512768)# 2. 模型配置(字典)llm_config = {    "model_name""LLM_Data_Pre",    "learning_rate"0.001,    "batch_size"32,    "max_epochs"50}# 3. 训练损失值(列表)loss_history = [0.350.310.280.260.24]# 4. 样本ID去重(集合)raw_sample_ids = [201202201203202204]unique_sample_ids = set(raw_sample_ids)# 5. 输出结果print("===== 大模型数据预处理结果 =====")print(f"输入维度:{input_shape}")print(f"模型配置:{llm_config}")print(f"损失值历史:{loss_history},平均损失:{sum(loss_history)/len(loss_history):.2f}")print(f"去重后样本数:{len(unique_sample_ids)},样本ID:{unique_sample_ids}")
运行结果:
===== 大模型数据预处理结果 =====输入维度:(512768)模型配置:{'model_name''LLM_Data_Pre''learning_rate'0.001'batch_size'32'max_epochs'50}损失值历史:[0.350.310.280.260.24],平均损失:0.29去重后样本数:4,样本ID:{201202203204}

总结

  1. 列表:有序可变,适合存储序列数据(损失值、日志);
  2. 元组:有序不可变,适合存储固定配置(输入维度);
  3. 字典:键值对结构,是大模型配置的核心载体;
  4. 集合:自动去重,适合数据清洗和集合运算。
Python 容器数据类型速记思维导图
下一篇预告

今天我们掌握了 4 种核心容器数据类型,能高效管理大模型的配置、数据和训练日志。下一篇将讲解函数与模块:把重复的数据处理、模型训练逻辑封装成函数,再打包成模块,让代码更简洁、可复用,这是大模型工程化开发的关键一步!

如果在代码中遇到问题,评论区贴出你的代码和报错信息, 觉得干货有用,点赞 + 在看 + 转发,让更多想入门大模型的朋友一起学!

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  1. CONNECT:[ UseTime:0.000839s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001556s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002927s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007043s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001519s ]
  6. SELECT * FROM `set` [ RunTime:0.008119s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001697s ]
  8. SELECT * FROM `article` WHERE `id` = 482482 LIMIT 1 [ RunTime:0.004314s ]
  9. UPDATE `article` SET `lasttime` = 1774589022 WHERE `id` = 482482 [ RunTime:0.009059s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002014s ]
  11. SELECT * FROM `article` WHERE `id` < 482482 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005595s ]
  12. SELECT * FROM `article` WHERE `id` > 482482 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004993s ]
  13. SELECT * FROM `article` WHERE `id` < 482482 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002819s ]
  14. SELECT * FROM `article` WHERE `id` < 482482 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015433s ]
  15. SELECT * FROM `article` WHERE `id` < 482482 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014771s ]
0.184480s