语义的归语义,语法的归语法。
基础定义
最基本的Native Function定义只需要在方法上添加 SKFunction
的特性即可。
using Microsoft.SemanticKernel.SkillDefinition;
using Microsoft.SemanticKernel.Orchestration;
namespace MySkillsDirectory;
public class MyCSharpSkill
{
[SKFunction("Return the first row of a qwerty keyboard")]
public string Qwerty(string input)
{
return "qwertyuiop";
}
[SKFunction("Return a string that's duplicated")]
public string DupDup(string text)
{
return text + text;
}
}
默认情况下只需要传递一个string 参数就行,如果需要多个参数的话,和Semantic Function一样,也是使用Context,不过这里传进去是 SKContext
。在方法上使用 SKFunctionContextParameter
声明一下参数,可以提供一定的说明,同时的有需要的话,可以设置参数的默认值。
using Microsoft.SemanticKernel.SkillDefinition;
using Microsoft.SemanticKernel.Orchestration;
namespace MySkillsDirectory;
public class MyCSharpSkill
{
[SKFunction("Return a string that's duplicated")]
public string DupDup(string text)
{
return text + text;
}
[SKFunction("Joins a first and last name together")]
[SKFunctionContextParameter(Name = "firstname", Description = "Informal name you use")]
[SKFunctionContextParameter(Name = "lastname", Description = "More formal name you use")]
public string FullNamer(SKContext context)
{
return context["firstname"] + " " + context["lastname"];
}
}
调用的时候,一样使用 ContextVariables
.
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.Orchestration;
using MySkillsDirectory;
// ... instantiate a kernel as myKernel
var myContext = new ContextVariables();
myContext.Set("firstname","Sam");
myContext.Set("lastname","Appdev");
var myCshSkill = myKernel.ImportSkill ( new MyCSharpSkill(), "MyCSharpSkill");
var myOutput = await myKernel.RunAsync(myContext,myCshSkill["FullNamer"]);
Console.WriteLine(myOutput);
当然异步的方法也是支持的。这样的话,就可以处理一些像是网络请求,数据库访问、文件读写等操作了。
using Microsoft.SemanticKernel.SkillDefinition;
using Microsoft.SemanticKernel.Orchestration;
public class MyCSharpSkill
{
[SKFunction("Return the first row of a qwerty keyboard")]
public string Qwerty(string input)
{
return "qwertyuiop";
}
[SKFunction("Return the second row of a qwerty keyboard")]
[SKFunctionName("Asdfg")]
public async Task<string> AsdfgAsync(string input)
{
await ...do something asynchronous...
return "asdfghjkl";
}
这里针对 AsdfgAsync
添加了一个 SKFunctionName
的特性,主要是为了使Function name 好看一些,避免 MyCSharpSkill.AsdfgAsync
这样。
混合调用
和 Semantic Function中能够调用 Native Function一样,在 Native Function也可以调用Semantic Function,其中主要使用的还是 SKContext
.
using Microsoft.SemanticKernel.SkillDefinition;
using Microsoft.SemanticKernel.Orchestration;
namespace MySkillsDirectory;
public class MyCSharpSkill
{
[SKFunction("Tell me a joke in one line of text")]
[SKFunctionName("TellAJokeInOneLine")]
public async Task<string> TellAJokeInOneLineAsync(SKContext context)
{
// Fetch a semantic function previously loaded into the kernel
ISKFunction joker1 = context.Func("funSkill", "joker");
// OR Fetch a semantic function previously loaded into the kernel
ISKFunction joker2 = context.Skills.GetSemanticFunction("funSkill", "joker");
var joke = await joker1.InvokeAsync();
return joke.Result.ReplaceLineEndings(" ");
}
}
这里并没有限制是 Semantic Function 还是Native Function,所以甚至可以完全使用Native Function编排技能调用,除了参数的定义和提取有些费劲以外,其他的几乎没什么问题,毕竟返回值都是string,这也就贯彻了Text is the universal wire protocol,即便是代码也得将就一下。
一些核心技能
Semantic Kernel 中大部分的能力都是有技能提供的,例如Semantic Kernel的一个核心组件Planner,其实就是一个Semantic Skill,另外官方提供了一些Core SKill,基本是日常比较常用的。具体可以参考https://github.com/microsoft/semantic-kernel/tree/main/dotnet/src/SemanticKernel/CoreSkills
和自行定义的Native Function一样的,只需要使用ImportSkill就行了
using Microsoft.SemanticKernel.CoreSkills;
// ( You want to instantiate a kernel and configure it first )
myKernel.ImportSkill(new TimeSkill(), "time");
const string ThePromptTemplate = @"
Today is: {{time.Date}}
Current time is: {{time.Time}}
Answer to the following questions using JSON syntax, including the data used.
Is it morning, afternoon, evening, or night (morning/afternoon/evening/night)?
Is it weekend time (weekend/not weekend)?";
var myKindOfDay = myKernel.CreateSemanticFunction(ThePromptTemplate, maxTokens: 150);
var myOutput = await myKindOfDay.InvokeAsync();
Console.WriteLine(myOutput);
至此,Semantic Kernel 的基础能力就学习得差不多了。文章来源:https://www.toymoban.com/news/detail-410845.html
参考资料:文章来源地址https://www.toymoban.com/news/detail-410845.html
- https://learn.microsoft.com/en-us/semantic-kernel/howto/nativefunctions
- https://learn.microsoft.com/en-us/semantic-kernel/howto/coreskills
- https://github.com/microsoft/semantic-kernel/tree/main/dotnet/src/SemanticKernel/CoreSkills
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