metadata

license: apache-2.0

LimaRP-Llama2-7B-v3 (Alpaca, experimental, 4-bit LoRA adapter)

This is an experimental version of LimaRP for Llama2, using a somewhat updated dataset (1800 training samples) and a 2-pass training procedure. The first pass includes unsupervised tuning on 2800 stories within 4k tokens length and the second pass is LimaRP with changes introducing more effective control on bot response length.

For more details about LimaRP, see the model page for the previously released version. Most details written there apply for this version as well.

Prompt format

Same as before. It uses the extended Alpaca format, with ### Input: immediately preceding user inputs and ### Response: immediately preceding model outputs. While Alpaca wasn't originally intended for multi-turn responses, in practice this is not a problem; the format follows a pattern already used by other models.

### Instruction:
Character's Persona: {bot character description}

User's Persona: {user character description}

Scenario: {what happens in the story}

Play the role of Character. You must engage in a roleplaying chat with User below this line. Do not write dialogues and narration for User.

### Input:
User: {utterance}

### Response:
Character: {utterance}

### Input
User: {utterance}

### Response:
Character: {utterance}

(etc.)

You should:

Replace all the text in curly braces (curly braces included) with your own text.
User and Character should be replaced with appropriate names.

Message length control

Inspired by the previously named "Roleplay" preset in SillyTavern, starting from this version of LimaRP it is possible to append a length modifier to the response instruction sequence, like this:

### Input
User: {utterance}

### Response: (length = medium)
Character: {utterance}

This has an immediately noticeable effect on bot responses. The available lenghts are: tiny, short, medium, long, huge, humongous, extreme, unlimited. The recommended starting length is medium or long. Keep in mind that the AI may ramble and impersonation can occur with very long messages.

The length control effect is reproducible, but the messages will not necessarily follow lengths very precisely, rather follow certain ranges on average, as seen in this table with data from tests made with one reply at the beginning of the conversation:

Response length control appears to work well also deep into the conversation.

Suggested settings

You can follow these instruction format settings in SillyTavern. Replace tiny with your desired response length:

Training procedure

Axolotl was used for training. The model has been trained as a 4-bit LoRA adapter. It's so large because a LoRA rank of 256 was used. It's suggested to merge it to the base Llama2-7B model.

Training hyperparameters

For the first pass these settings were used:

learning_rate: 0.0002
lr_scheduler_type: constant
lora_r: 256
lora_alpha: 16
lora_dropout: 0.1
lora_target_linear: True
num_epochs: 1
bf16: True
tf32: True
load_in_4bit: True
adapter: qlora
micro_batch_size: 2
gradient_accumulation_steps: 1
optimizer: adamw_torch

In the second pass, the lora_model_dir option was used to load and train the adapter previously trained on a stories dataset. These settings were also changed:

lora_dropout: 0.0
gradient_accumulation_steps: 8
learning_rate: 0.0006