qwen25-7b-sarcasm-joint400-source

Sarcasm source adapter — pure DPO for weight arithmetic

A sarcasm-oriented source adapter trained to provide the subtraction/projection direction in the humor-mitigation experiment. It is also available as a standalone research model.

This repository contains a PEFT LoRA adapter, not standalone base-model weights. Load it on Qwen/Qwen2.5-7B-Instruct at the revision below. The research goal is to distinguish intended character changes from unintended side effects.

What the name means

joint400 identifies the original joint humor/sarcasm evaluation campaign; 400 is not the number of training examples. The distinguishing intervention is Sarcasm source adapter — pure DPO for weight arithmetic. Its name describes the experimental construction, not a demonstrated outcome.

How this adapter was produced

Train on all 8,644 OCT sarcasm preference pairs using pure DPO: beta 0.1, chosen-answer NLL coefficient 0, and explicit preservation coefficient 0. No introspective SFT is applied. This source is distinct from the later sarcasm–misalignment full baseline, which uses NLL 0.1 and preservation 0.001.

Training data and recipe

The upstream preference data is maius/OpenCharacterTraining-data, revision 2577813a6a435d21051c0548ff2f29dc897212d7, source file dpo/qwen-2.5-7b-it/sarcasm.jsonl. Each example contains a prompt and chosen/rejected continuations. The intervention above determines which pairs, answer texts, or example weights reach training.

Training starts from the pinned instruction-tuned base. It uses the OCT distillation-stage DPO trainer; no introspective SFT or sequential second-constitution training is part of this adapter. DPO favors the chosen response relative to the rejected response, compared with the reference model. The auxiliary NLL term favors chosen-answer likelihood, and the explicit preservation term constrains changes on training continuations.

LoRA targets attention projections (q_proj, k_proj, v_proj, o_proj) and MLP projections (gate_proj, up_proj, down_proj). The published adapter configuration is authoritative for loading.

The recorded trainer runtime reports 8,644 rows after filtering, 270 optimizer updates, and 4 tail microbatches. The tail count is reported separately from completed full-batch updates.

Recommended comparisons and interpretation

This provides the sarcasm update for the humor minus-sarcasm and humor projection-removed models. Compare its objective carefully with the later regularized sarcasm baseline.

Using a pure-DPO sarcasm direction alongside a regularized humor direction means the source objectives are not identical.

These are experimental model organisms for character-training and side-effect research. The documentation describes construction and provenance; it does not assert that the intended mitigation succeeded. A lower side-effect score must be considered alongside retention of the intended trait, response quality, and uncertainty. Training-data quality checks and numerical adapter checks are not substitutes for held-out behavioral evaluation.

Reproducibility and provenance

• Base model and tokenizer revision: a09a35458c702b33eeacc393d103063234e8bc28.
• Adapter snapshot documented here: e02242a6413b95b1ef764e5313e85434a511d12b. This is the immutable snapshot before the expanded model-card update.
• OCT source revision: d1da9f03628cb4c5482ba2e494a7cba33bcd5818.
• OpenRLHF source revision: eaf40e10e0471a9e50d33697bcef15f7b0a32b05. Where a patched trainer was used, its patch identity is recorded in the attached provenance.
• Machine-readable record: training_provenance.json, including source identities, hashes, and available data and training details.
• Training dataset SHA-256: 3585ee16b02b2c007f046adfe9fff8c8470282636275b16559b88d845160a7c5.

Loading the adapter

Load the base and tokenizer explicitly. Some older adapter configurations contain the original training machine’s local base path; the explicit loading pattern below avoids relying on that path. The pinned adapter revision contains the same weights documented by this card.

from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel

base_id = "Qwen/Qwen2.5-7B-Instruct"
base_revision = "a09a35458c702b33eeacc393d103063234e8bc28"
adapter_id = "jchang153/qwen25-7b-sarcasm-joint400-source"
adapter_revision = "e02242a6413b95b1ef764e5313e85434a511d12b"

tokenizer = AutoTokenizer.from_pretrained(base_id, revision=base_revision)
base = AutoModelForCausalLM.from_pretrained(
    base_id, revision=base_revision, torch_dtype="auto", device_map="auto"
)
model = PeftModel.from_pretrained(base, adapter_id, revision=adapter_revision)
model.eval()

Use the base tokenizer’s chat template. Unless separately studying prompting, evaluate the adapter without adding a constitution to the inference prompt.

Data terms and related work

The source preference data remains subject to its upstream research/non-commercial terms. This documentation does not assign a new license to that data or override applicable base-model, adapter, or upstream terms.

• Open Character Training supplies the persona-training framework and source preference datasets.
• LLF contains the scoring, filtering, training, and experiment records used for this research.
• Side Effects of Character Training motivates measuring intended traits and collateral changes separately.