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MazelTovy/thinking-on-the-move-dtbk

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Thinking on the Move — Downtown Brooklyn LoRA adapter

LoRA fine-tune of meta-llama/Llama-3.1-8B-Instruct on lunch-time restaurant choice in Downtown Brooklyn (DTBK), built for the NYU CUSP capstone project Thinking on the Move: An LLM-Agent Framework for Modeling Urban Consumption Choices from Mobility Traces.

Code: <https://github.com/MazelTovy/thinking-on-the-move> Poster: `docs/poster.pdf`

What it does

Given a worker's demographic persona + a list of nearby candidate restaurants, this adapter predicts which restaurant the worker is most likely to visit next, with a ranked top-5 + probabilities.

Input prompt template:

SYSTEM:
You are a behavioral analyst. Predict which restaurant the worker
will visit next based on their persona and the candidate list.

USER:
--- AGENT PERSONA ---
{cluster_persona_text}

--- CANDIDATE RESTAURANTS ---
- id={poi_id} | {sub_category} | {distance_m}m | freq={cluster_freq}
- ...

--- TASK ---
Predict the SINGLE most likely restaurant the worker will visit next.
Provide a ranked Top-5 list with probabilities that sum to 1.0.
Output JSON only, no explanation.
{"next_choice": "<poi_id>", "top_5": [{"poi": "<poi_id>", "prob": <float>}]}

Output (JSON):

json

{
  "next_choice": "Brooklyn Pantry and Coffee Shop|40.693856|-73.988042",
  "top_5": [
    {"poi": "Brooklyn Pantry and Coffee Shop|40.693856|-73.988042", "prob": 0.62},
    {"poi": "Teranga Brooklyn|40.6912|-73.9847",                     "prob": 0.14},
    {"poi": "DGGD Coffee Shop|40.6940|-73.9879",                     "prob": 0.10},
    {"poi": "Starbucks|40.6938|-73.9871",                            "prob": 0.08},
    {"poi": "Cammareri Bakery & Cafe|40.6845|-73.9848",              "prob": 0.06}
  ]
}

Training


Base	`meta-llama/Llama-3.1-8B-Instruct`
Adapter	LoRA on all attention + MLP linear layers
LoRA r / α / dropout	16 / 32 / 0.05
Trainable params	~80 M (1.0 % of base)
Optimiser	AdamW
Learning rate	2e-4, cosine, 100 warmup steps
Batch	4 × grad-accum 8 = effective 32
Max length	2048 tokens
Epochs	3
Train visits	~18 k DTBK visits, Q1-Q4 2021
Validation	last-60-day temporal hold-out
Compute	1 × NVIDIA H100, ~2 h

Evaluation (DTBK Q1 2022 OOS, 6 028 trips, 667 active POIs)

Metric	Value
Spearman (per-POI mass)	0.629
NDCG@10	0.822
JS divergence	0.185
POI coverage	0.840

For comparison against the 8 classical baselines see results/dtbk_metrics.json in the project repo.

How to use

python

from peft import PeftModel
from transformers import AutoModelForCausalLM, AutoTokenizer

base = "meta-llama/Llama-3.1-8B-Instruct"
adapter = "MazelTovy/thinking-on-the-move-dtbk"

tok = AutoTokenizer.from_pretrained(base)
model = AutoModelForCausalLM.from_pretrained(base, torch_dtype="bfloat16", device_map="auto")
model = PeftModel.from_pretrained(model, adapter)

For batched inference at scale, prefer vLLM:

bash

huggingface-cli download MazelTovy/thinking-on-the-move-dtbk --local-dir ./adapter
python -m tom.infer_vllm \
    --records_in your_inference_records.jsonl \
    --model_path meta-llama/Llama-3.1-8B-Instruct \
    --lora_path ./adapter \
    --out predictions.jsonl

Intended use & limitations

Designed for: research into urban consumption demand, retail substitution analysis, neighborhood-scale economic resilience studies, counterfactual closure simulations.

Not designed for: identifying or re-identifying individual users, surveillance, ad targeting, or any decision affecting a specific named worker.

Known limitations:

—Fitted to Downtown Brooklyn (≈ 4 km² in Kings County, NY). Cross-city transfer is untested — the NYC-Metro adapter (MazelTovy/thinking-on-the-move-nyc) is trained on a much larger geography.
—Cuebiq users skew younger and more smartphone-active than the general population; demographic re-weighting at the cluster level mitigates but does not eliminate this.
—POI universe drifts week-to-week; predictions assume the candidate set reflects the active universe at the prediction week.

Citation

bibtex

@unpublished{xu2026tom,
  title  = {Thinking on the Move: An LLM-Agent Framework for Modeling
            Urban Consumption Choices from Mobility Traces},
  author = {Xu, Sizhe (Alex) and Natekar, Divya},
  year   = {2026},
  note   = {NYU CUSP capstone, P38; in collaboration with Downtown
            Brooklyn Partnership.}
}

Please also cite the base model (Llama 3 herd):