{"id":1403,"date":"2024-05-09T15:34:38","date_gmt":"2024-05-09T15:34:38","guid":{"rendered":"https:\/\/www.nicekj.com\/?p=1403"},"modified":"2024-05-09T15:34:44","modified_gmt":"2024-05-09T15:34:44","slug":"yiwengaodong-langchain-models-si","status":"publish","type":"post","link":"https:\/\/www.nicekj.com\/yiwengaodong-langchain-models-si.html","title":{"rendered":"\ud83d\udd25\ud83d\udd25\ud83d\udd25 \u4e00\u6587\u641e\u61c2 Langchain Models \uff08\u56db\uff09"},"content":{"rendered":"<blockquote>\n<p>\u63a5\u4e0a\u6587<a href=\"https:\/\/juejin.cn\/post\/7295720738568306723\" target=\"_blank\" title=\"https:\/\/juejin.cn\/post\/7295720738568306723\" rel=\"noopener\">\ud83d\udd25\ud83d\udd25\ud83d\udd25 \u4e00\u6587\u641e\u61c2 Langchain Models \uff08\u4e09\uff09<\/a>\u3002<\/p>\n<\/blockquote>\n<h2 data-id=\"heading-0\">\u63d0\u793a\u6a21\u677f\uff08Prompt Templates  \uff09<\/h2>\n<p>\u5728\u6784\u5efa\u52a8\u6001\u7684\u3001\u9762\u5411\u7528\u6237\u7684\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u4e00\u822c\u4e0d\u4f1a\u5bf9\u63d0\u793a\u8fdb\u884c\u786c\u7f16\u7801\u3002\u6211\u4eec\u9700\u8981\u80fd\u591f\u5728\u63d0\u793a\u6a21\u677f\u4e2d\u4f7f\u7528\u7528\u6237\u8f93\u5165\u6765\u6784\u5efa\u63d0\u793a\u3002LangChain \u63d0\u4f9b\u4e86\u6784\u5efa\u8fd9\u4e9b\u63d0\u793a\u6a21\u677f\u548c\u52a8\u6001\u63d2\u5165\u8f93\u5165\u7684\u7c7b\u3002<\/p>\n<p>\u63d0\u793a\u6a21\u677f\u5141\u8bb8\u60a8\u4f20\u5165\u53d8\u91cf\u503c\u4ee5\u52a8\u6001\u8c03\u6574\u4f20\u9012\u7ed9LLM\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u6765\u81ea\u6587\u6863\u7684\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">python<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-python code-block-extension-codeShowNum\" lang=\"python\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\">rom langchain.prompts.chat <span class=\"hljs-keyword\">import<\/span> (<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\">    ChatPromptTemplate,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\">    SystemMessagePromptTemplate,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\">    HumanMessagePromptTemplate,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\">)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"6\">...<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"7\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"8\">system_template=<span class=\"hljs-string\">\"You are a helpful assistant that translates {input_language} to {output_language}.\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"9\">system_message_prompt = SystemMessagePromptTemplate.from_template(system_template)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"10\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"11\"><span class=\"hljs-comment\"># SystemMessagePromptTemplate(prompt=PromptTemplate(input_variables=['input_language', 'output_language'], output_parser=None, partial_variables={}, template='You are a helpful assistant that translates {input_language} to {output_language}.', template_format='f-string', validate_template=True), additional_kwargs={})<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"12\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"13\">human_template=<span class=\"hljs-string\">\"{text}\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"14\">human_message_prompt = HumanMessagePromptTemplate.from_template(human_template)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"15\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"16\"><span class=\"hljs-comment\"># HumanMessagePromptTemplate(prompt=PromptTemplate(input_variables=['text'], output_parser=None, partial_variables={}, template='{text}', template_format='f-string', validate_template=True), additional_kwargs={})<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"17\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"18\">chat_prompt = ChatPromptTemplate.from_messages([system_message_prompt, human_message_prompt])<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"19\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"20\"><span class=\"hljs-comment\"># ChatPromptTemplate(input_variables=['output_language', 'input_language', 'text'], output_parser=None, partial_variables={}, messages=[SystemMessagePromptTemplate(prompt=PromptTemplate(input_variables=['input_language', 'output_language'], output_parser=None, partial_variables={}, template='You are a helpful assistant that translates {input_language} to {output_language}.', template_format='f-string', validate_template=True), additional_kwargs={}), HumanMessagePromptTemplate(prompt=PromptTemplate(input_variables=['text'], output_parser=None, partial_variables={}, template='{text}', template_format='f-string', validate_template=True), additional_kwargs={})])<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"21\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"22\"><span class=\"hljs-comment\"># get a chat completion from the formatted messages<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"23\">chat(chat_prompt.format_prompt(input_language=<span class=\"hljs-string\">\"English\"<\/span>, output_language=<span class=\"hljs-string\">\"French\"<\/span>, text=<span class=\"hljs-string\">\"I love programming.\"<\/span>).to_messages())<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"24\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"25\"><span class=\"hljs-comment\"># AIMessage(content=\"J'adore la programmation.\", additional_kwargs={})<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"26\"><\/span>\n<\/code><\/pre>\n<p>\u5728\u5e95\u5c42\uff0cLangChain \u4f7f\u7528\u4e86\u5185\u7f6e\u7684\u5b57\u7b26\u4e32\u5e93\u7684 Formatter \u7c7b\u6765\u89e3\u6790\u4f7f\u7528\u4f20\u5165\u53d8\u91cf\u7684\u6a21\u677f\u6587\u672c\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6a21\u677f\u4e2d\u7684\u53d8\u91cf\u5468\u56f4\u6709\u5927\u62ec\u53f7\uff08{}\uff09\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u6a21\u677f\u53d1\u751f\u7684\u4e8b\u60c5\u7684\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">python<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-python code-block-extension-codeShowNum\" lang=\"python\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\"><span class=\"hljs-keyword\">from<\/span> string <span class=\"hljs-keyword\">import<\/span> Formatter<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\">formatter = Formatter()<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\">format_string = <span class=\"hljs-string\">\"Hello, {name}! You are {age} years old.\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\">result = formatter.<span class=\"hljs-built_in\">format<\/span>(format_string, name=<span class=\"hljs-string\">\"John\"<\/span>, age=<span class=\"hljs-number\">30<\/span>)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"6\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"7\"><span class=\"hljs-built_in\">print<\/span>(result)  <span class=\"hljs-comment\"># Output: \"Hello, John! You are 30 years old.\"<\/span><\/span>\n<\/code><\/pre>\n<p>LangChain \u63d0\u4f9b\u4e86\u5173\u4e8e Chat Models \u7684\u51e0\u4e2a\u6307\u5357\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/link.juejin.cn?target=https%3A%2F%2Fpython.langchain.com%2Fdocs%2Fmodules%2Fmodel_io%2Fprompts%2Fprompt_templates%2Ffew_shot_examples_chat%3Fref%3Ddavidgentile.net\" target=\"_blank\" title=\"https:\/\/python.langchain.com\/docs\/modules\/model_io\/prompts\/prompt_templates\/few_shot_examples_chat?ref=davidgentile.net\" ref=\"nofollow noopener noreferrer\" rel=\"noopener\">\u5982\u4f55\u4f7f\u7528\u5c11\u6570\u793a\u4f8b<\/a>\n\u201c\u5c11\u6570\u793a\u4f8b\u63d0\u793a\uff08Few-Shot Prompting\uff09\u201d\u662f\u4e00\u79cd\u6280\u672f\uff0c\u5728\u63d0\u793a\u4e2d\u63d0\u4f9b\u9884\u671f\u54cd\u5e94\u7684\u793a\u4f8b\uff0c\u4ee5\u4fbf\u5bf9LLM\u8fdb\u884c\u201c\u6761\u4ef6\u201d\u8bbe\u7f6e\uff0c\u4ee5\u6307\u5bfc\u5982\u4f55\u56de\u5e94\u3002<\/li>\n<li><a href=\"https:\/\/link.juejin.cn?target=https%3A%2F%2Fgithub.com%2Fopenai%2Fopenai-cookbook%2Fblob%2Fmain%2Fexamples%2FHow_to_stream_completions.ipynb\" target=\"_blank\" title=\"https:\/\/github.com\/openai\/openai-cookbook\/blob\/main\/examples\/How_to_stream_completions.ipynb\" ref=\"nofollow noopener noreferrer\" rel=\"noopener\">\u5982\u4f55\u6d41\u5f0f\u4f20\u8f93\u54cd\u5e94<\/a>\n\u901a\u8fc7\u6d41\u5f0f\u4f20\u8f93\uff0c\u60a8\u53ef\u4ee5\u5728\u4ece LLM \u63a5\u6536\u5230\u54cd\u5e94\u6587\u672c\u65f6\u7acb\u5373\u663e\u793a\uff0c\u800c\u65e0\u9700\u7b49\u5f85\u6574\u4e2a\u54cd\u5e94\u3002\u8fd9\u65e0\u7591\u589e\u52a0\u4e86\u201c\u804a\u5929\u201d\u7684\u4f53\u9a8c\u3002<\/li>\n<\/ul>\n<h2 data-id=\"heading-1\">\u5d4c\u5165\u6a21\u578b\uff08Text Embedding Models\uff09<\/h2>\n<p>\u5d4c\u5165\u662f\u4e00\u79cd\u5c06\u5355\u8bcd\u3001\u77ed\u8bed\u6216\u53e5\u5b50\u8f6c\u6362\u4e3a\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u5b57\u5217\u8868\u7684\u65b9\u6cd5\uff0c\u7528\u4e8e\u81ea\u7136\u8bed\u8a00\u5904\u7406\uff08NLP\uff09\u3002\u8fd9\u901a\u8fc7\u5c06\u5b83\u4eec\u8f6c\u6362\u4e3a\u6570\u503c\u5f62\u5f0f\uff08\u79f0\u4e3a\u201c\u5411\u91cf\u201d\uff09\u6765\u5e2e\u52a9\u7b97\u6cd5\u66f4\u597d\u5730\u7406\u89e3\u548c\u5904\u7406\u6587\u672c\u6570\u636e\u3002\u5d4c\u5165\u5c55\u793a\u4e86\u5355\u8bcd\u7684\u610f\u4e49\u548c\u7ed3\u6784\uff0c\u76f8\u4f3c\u7684\u5355\u8bcd\u5177\u6709\u76f8\u4f3c\u7684\u5d4c\u5165\u3002<\/p>\n<p>\u4e00\u65e6\u6211\u4eec\u5c06\u5355\u8bcd\u8f6c\u6362\u6210\u8fd9\u4e9b\u201c\u5411\u91cf\u201d\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u6570\u5b66\u65b9\u6cd5\u6765\u8ba1\u7b97\u5355\u8bcd\u4e4b\u95f4\u7684\u76f8\u4f3c\u6027\u6216\u5dee\u5f02\u6027\u3002\u8fd9\u88ab\u8bc1\u660e\u975e\u5e38\u5f3a\u5927\uff0c\u4e5f\u662f\u4e3a\u4ec0\u4e48\u6700\u65b0\u7684 LLMs \u6bd4\u4ee5\u524d\u7684\u7cfb\u7edf\u66f4\u52a0\u5b9e\u7528\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5c06\u53e5\u5b50 &#8220;This is how embeddings work&#8221; \u8f6c\u6362\u4e3a\u5d4c\u5165\u7684\u9ad8\u7ea7\u793a\u4f8b\u3002<\/p>\n<p>\u5c06\u53e5\u5b50\u5206\u8bcd\u4e3a\u5355\u8bcd\uff1a[&#8220;This&#8221;, &#8220;is&#8221;, &#8220;how&#8221;, &#8220;embeddings&#8221;, &#8220;work&#8221;]<\/p>\n<p>\u4f7f\u7528\u9884\u8bad\u7ec3\u7684\u5d4c\u5165\u6a21\u578b\u5c06\u6bcf\u4e2a\u5355\u8bcd\u8f6c\u6362\u4e3a\u5176\u76f8\u5e94\u7684\u5d4c\u5165\u5411\u91cf\u3002\u6bcf\u4e2a\u5411\u91cf\u901a\u5e38\u8868\u793a\u4e3a\u4e00\u7ec4\u56fa\u5b9a\u957f\u5ea6\u7684\u6d6e\u70b9\u6570\uff1a<\/p>\n<p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.nicekj.com\/wp-content\/uploads\/replace\/596157be3ea429f8ab858b8482fd03f6.png\" alt=\"image.png\" \/><\/figure>\n<\/p>\n<p>\u73b0\u5728\uff0c\u53e5\u5b50 &#8220;This is how embeddings work&#8221; \u53ef\u4ee5\u8868\u793a\u4e3a\u4e00\u7cfb\u5217\u5d4c\u5165\u5411\u91cf\uff1a<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">text<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-text code-block-extension-codeShowNum\" lang=\"text\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\">[   <\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\">\t[0.12, -0.23, 0.56, ..., 0.07],<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\">    [-0.15, 0.28, 0.31, ..., -0.03],<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\">    [0.42, -0.12, -0.67, ..., 0.09],<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\">    [0.22, 0.16, 0.08, ..., -0.24],<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"6\">    [-0.04, -0.32, 0.25, ..., 0.13]<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"7\">]<\/span>\n<\/code><\/pre>\n<p>\u4e00\u65e6\u4f60\u62e5\u6709\u4e86\u5411\u91cf\u5e8f\u5217\uff0c\u4f60\u53ef\u4ee5\u8fd0\u884c\u8bf8\u5982\u8bed\u4e49\u641c\u7d22\u4e4b\u7c7b\u7684\u67e5\u8be2\uff0c\u4ee5\u8fd4\u56de\u6700\u76f8\u5173\u7684\u7ed3\u679c\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>\u63d0\u793a\u6a21\u677f\uff08Prompt Templates \uff09 \u5728\u6784\u5efa\u52a8\u6001\u7684\u3001\u9762\u5411\u7528\u6237\u7684\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u4e00\u822c\u4e0d\u4f1a\u5bf9\u63d0\u793a\u8fdb\u884c\u786c\u7f16\u7801\u3002\u6211\u4eec\u9700\u8981\u80fd\u591f\u5728\u63d0\u793a\u6a21\u677f\u4e2d\u4f7f\u7528\u7528\u6237\u8f93\u5165\u6765\u6784\u5efa\u63d0\u793a\u3002LangChain \u63d0\u4f9b\u4e86\u6784\u5efa\u8fd9\u4e9b\u63d0\u793a\u6a21\u677f<\/p>\n","protected":false},"author":1,"featured_media":8274,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"rank_math_title":"","rank_math_description":"","rank_math_focus_keyword":"","views":"","footnotes":""},"categories":[3],"tags":[126,127,128,129,136],"collection":[],"class_list":["post-1403","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fenlei2","tag-gpt","tag-ai","tag-128","tag-129","tag-136"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/posts\/1403","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/comments?post=1403"}],"version-history":[{"count":0,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/posts\/1403\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/media\/8274"}],"wp:attachment":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/media?parent=1403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/categories?post=1403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/tags?post=1403"},{"taxonomy":"collection","embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/collection?post=1403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}