Tailorbird v0.2

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Small bird. Sharp memory. Tailorbird turns sprawling conversation history into compact handoff notes without dropping the decisions that matter.

Tailorbird v0.2 is a 2.5B-parameter conversation-memory compression specialist fine-tuned from openbmb/MiniCPM5-2B-Midtrain. It is trained to preserve durable facts, decisions, constraints, identifiers, superseded values, and open work while stripping repetition and conversational filler.

This repository contains the standalone, non-quantized BF16 model with its LoRA adapter merged into the base weights. No adapter juggling required: load it and fly.

What it is good at

Compressing long, multi-turn conversations into terse continuation context
Separating FACTS, DECISIONS, CONSTRAINTS, and OPEN items
Tracking replacements with explicit SUPERSEDES: old -> new notation
Preserving exact ticket IDs, paths, dates, commands, URLs, and error strings
Emitting (no update) when a conversation adds nothing durable
Adding a short STORY only when the overall goal or status changes

Quick start

import torch
from transformers import AutoModelForCausalLM, AutoTokenizer

model_id = "vcerny/tailorbird-v0.2"
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(
    model_id,
    torch_dtype=torch.bfloat16,
    device_map="auto",
)

messages = [
    {
        "role": "user",
        "content": """Compress conversation history for another model. Output notes only.
Append ONLY new durable information; committed notes stay unchanged.
Use terse FACTS/DECISIONS/CONSTRAINTS/OPEN lines.

Committed notes (reference only):
FACTS: Deployment uses image v1.4.

New messages:
user: Move the rollout from Tuesday to Thursday.
assistant: Noted. The rollout is now planned for Thursday.
""",
    }
]

inputs = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    return_tensors="pt",
).to(model.device)

with torch.inference_mode():
    generated = model.generate(
        inputs,
        max_new_tokens=256,
        do_sample=False,
    )

print(tokenizer.decode(generated[0, inputs.shape[-1]:], skip_special_tokens=True))

For best results, keep the compression contract explicit in the prompt and use greedy decoding when deterministic handoff notes matter.

Training snapshot

Item	Value
Base model	`openbmb/MiniCPM5-2B-Midtrain`
Method	Supervised fine-tuning with LoRA, merged after training
Training examples	2,542
Validation examples	147
Held-out test examples	116
Epochs	2
Maximum training sequence length	2,048 tokens
LoRA	rank 16, alpha 32, dropout 0, all linear layers
Effective batch size	8
Optimizer	8-bit AdamW
Peak learning rate	2e-4 with linear decay
Final aggregate training loss	0.9681
Validation loss	0.9464 at epoch 1; 0.9173 at epoch 2
Training hardware	NVIDIA H200 NVL MIG 1g.18gb, 16 GiB visible memory
Output precision	Merged BF16, non-quantized

The held-out test split was not consumed during training. No held-out benchmark is reported yet, so the validation loss should not be treated as a complete measure of real-world accuracy.

Intended use

Tailorbird is intended for conversation compaction, agent handoffs, rolling memory updates, and structured session summaries. It is especially suited to workflows where dropping a constraint or silently reviving an obsolete value is more damaging than producing slightly awkward prose.

It is not a source of truth. Review outputs before using them for operational, legal, medical, financial, or safety-critical decisions. The model can omit, merge, or misclassify details and may reproduce sensitive information present in its input. Apply access controls and retention rules appropriate to your data.

Limitations

Training and evaluation focus on English structured-memory prompts.
Exact output shape depends strongly on the prompt contract.
Very long inputs were not exercised at the model's architectural context limit; fine-tuning used sequences up to 2,048 tokens.
Validation loss measures next-token prediction, not factual retention or downstream task success.
The merged model is approximately 5 GB and is not quantized for edge use.

Training stack

Built with Unsloth, TRL 0.24.0, Transformers 5.17.0, PyTorch 2.11.0+cu128, Datasets 4.3.0, and Tokenizers 0.23.2. Training used seed 3407.

Base model and license

Tailorbird v0.2 derives from openbmb/MiniCPM5-2B-Midtrain. See the base model card for architecture details, upstream limitations, and citations. This model is distributed under the Apache License 2.0.