Merge branch 'chat_update'

src/libs/LangChain.Core/Chains/Chain.cs

@@ -149,13 +149,20 @@ public static StuffDocumentsChain CombineDocuments(
     /// <param name="responseKey"></param>
     /// <returns></returns>
     public static UpdateMemoryChain UpdateMemory(
-        BaseChatMemory memory,
+        ConversationBufferMemory memory,
         string requestKey = "text",
         string responseKey = "text")
     {
         return new UpdateMemoryChain(memory, requestKey, responseKey);
     }
 
+    public static LoadMemoryChain LoadMemory(
+        ConversationBufferMemory memory,
+        string outputKey = "text")
+    {
+        return new LoadMemoryChain(memory, outputKey);
+    }
+
     /// <summary>
     /// 
     /// </summary>

src/libs/LangChain.Core/Chains/StackableChains/LoadMemoryChain.cs

@@ -0,0 +1,27 @@
+using LangChain.Abstractions.Schema;
+using LangChain.Chains.HelperChains;
+using LangChain.Memory;
+
+namespace LangChain.Chains.StackableChains;
+
+public class LoadMemoryChain: BaseStackableChain
+{
+
+    private readonly ConversationBufferMemory _chatMemory;
+    private readonly string _outputKey;
+
+    public LoadMemoryChain(ConversationBufferMemory chatMemory,string outputKey)
+    {
+
+        _chatMemory = chatMemory;
+        _outputKey = outputKey;
+
+        OutputKeys = new[] {_outputKey};
+    }
+
+    protected override Task<IChainValues> InternalCall(IChainValues values)
+    {
+        values.Value[_outputKey] = _chatMemory.BufferAsString;
+        return Task.FromResult(values);
+    }
+}