ConversationBufferWindowMemory class final

ConversationBufferWindowMemory is a type of memory that stores a conversation in chatHistory and then retrieves the last k interactions with the model (i.e. the last k input messages and the last k output messages).

It uses ChatMessageHistory as in-memory storage by default.

Example:

final memory = ConversationBufferWindowMemory(k: 10);
await memory.saveContext({'input': 'bar'}, {'output': 'foo'});
final res = await memory.loadMemoryVariables();
// {'history': 'Human: bar\nAI: foo'}
Inheritance

Constructors

ConversationBufferWindowMemory.new({BaseChatMessageHistory? chatHistory, String? inputKey, String? outputKey, bool returnMessages = false, int k = 5, String memoryKey = BaseMemory.defaultMemoryKey, String systemPrefix = SystemChatMessage.defaultPrefix, String humanPrefix = HumanChatMessage.defaultPrefix, String aiPrefix = AIChatMessage.defaultPrefix, String toolPrefix = ToolChatMessage.defaultPrefix})
ConversationBufferWindowMemory is a type of memory that stores a conversation in chatHistory and then retrieves the last k interactions with the model (i.e. the last k input messages and the last k output messages).

Properties

aiPrefix → String
The prefix to use for AI messages if returnMessages is false.
final
chatHistory → BaseChatMessageHistory
The chat history.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
humanPrefix → String
The prefix to use for human messages if returnMessages is false.
final
inputKey → String?
The input key to use for the chat history.
finalinherited
k → int
Number of interactions to store in the buffer.
final
memoryKey → String
The memory key to use for the chat history. This will be passed as input variable to the prompt.
final
memoryKeys → Set<String>
Input keys this memory class will load dynamically to the prompt.
no setteroverride
outputKey → String?
The output key to use for the chat history.
finalinherited
returnMessages → bool
If true, when loadMemoryVariables is called, it will return ChatMessage objects. If false, it will return a String representation of the messages.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
systemPrefix → String
The prefix to use for system messages if returnMessages is false.
final
toolPrefix → String
The prefix to use for tool messages if returnMessages is false.
final

Methods

clear() → Future<void>
Clear memory contents.
inherited
loadMemoryVariables([MemoryInputValues values = const {}]) → Future<MemoryVariables>
Returns key-value pairs given the MemoryInputValues.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
saveContext({required MemoryInputValues inputValues, required MemoryOutputValues outputValues}) → Future<void>
Save the context of this model run to memory.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited