Oransim — Causal Digital Twin for Marketing

Skill by ara.so — Daily 2026 Skills collection.

Oransim is an open-source causal simulation engine for marketing teams. It lets you predict campaign ROI, run counterfactual "what if" scenarios (swap KOLs, reallocate budget, change platforms), and audit every prediction through a transparent 64-node causal graph — before spending a dollar.

Core capabilities:

• Pre-launch ROI ranking across creative × KOL × budget combinations
• Mid-campaign

  do()

  -operator rollouts (e.g. swap KOL on day 3, see 14-day path diff)
• Post-mortem counterfactuals (what if we'd spent on 小红书 instead of 抖音?)
• LLM-backed "soul personas" for 1M+ virtual consumer agents
• Causal Neural Hawkes Process for temporal cascade simulation
• Per-arm counterfactual heads (TARNet / Dragonnet architecture)

Installation

git clone https://github.com/OranAi-Ltd/oransim.git
cd oransim
pip install -e '.[dev]'

Backend (mock mode — no API key needed)

LLM_MODE=mock python -m uvicorn oransim.api:app --port 8001

Backend (real LLM pipeline)

LLM_MODE=api \
LLM_API_KEY=$YOUR_LLM_API_KEY \
LLM_MODEL=gpt-4o \
python -m uvicorn oransim.api:app --port 8001

Frontend

python -m http.server 8090 --directory frontend
# Open http://localhost:8090

Configuration

All config via environment variables (see

.env.example

# LLM mode: "mock" (deterministic stubs) or "api" (real LLM)
LLM_MODE=api

# Provider: openai (default), anthropic, gemini, qwen
LLM_PROVIDER=openai

# API key (also accepts provider-specific: OPENAI_API_KEY, ANTHROPIC_API_KEY, etc.)
LLM_API_KEY=sk-...

# Model
LLM_MODEL=gpt-4o

# Custom base URL (DeepSeek, vLLM, etc.)
LLM_BASE_URL=https://api.deepseek.com/v1

Provider quick-reference

LLM_PROVIDER

LLM_BASE_URL

openai

https://api.openai.com/v1

gpt-4o

openai

https://api.deepseek.com/v1

deepseek-chat

openai

http://localhost:8000/v1

anthropic

claude-sonnet-4-6

gemini

gemini-2.5-flash

qwen

qwen-plus

Key API Endpoints

All endpoints served at

http://localhost:8001

POST

/api/predict

— Run a campaign simulation

import httpx

payload = {
    "campaign": {
        "name": "Summer Beauty Launch",
        "platform": "xhs",           # xhs | douyin | tiktok
        "budget": 500000,            # CNY
        "duration_days": 14,
        "creatives": [
            {"id": "vid_A", "type": "video", "duration_sec": 30},
            {"id": "vid_B", "type": "video", "duration_sec": 60},
        ],
        "kols": [
            {"id": "kol_001", "tier": "mid", "vertical": "beauty", "fans": 250000},
            {"id": "kol_002", "tier": "koc", "vertical": "skincare", "fans": 45000},
        ],
        "budget_split": {"xhs": 0.6, "douyin": 0.4},
    },
    "mode": "fast",   # "fast" (quantile baseline) | "full" (LLM agent simulation)
    "n_simulations": 100,
}

response = httpx.post("http://localhost:8001/api/predict", json=payload, timeout=120)
result = response.json()

print(result["roi"]["p50"])    # median ROI
print(result["roi"]["p35"])    # lower confidence band
print(result["roi"]["p65"])    # upper confidence band
print(result["causal_path"])   # which nodes drove the prediction

GET

/api/graph/inspect

— Audit the causal graph

import httpx, json

graph = httpx.get("http://localhost:8001/api/graph/inspect").json()
print(f"Nodes: {len(graph['nodes'])}")   # 64 nodes
print(f"Edges: {len(graph['edges'])}")   # 117 edges

# Find all paths from budget allocation to purchase intent
for edge in graph["edges"]:
    if edge["source"] == "budget_allocation":
        print(edge)

POST

/api/sandbox/counterfactual

— Mid-campaign KOL swap

import httpx

# Scenario: campaign running, day 3, swap KOL
counterfactual = httpx.post(
    "http://localhost:8001/api/sandbox/counterfactual",
    json={
        "base_campaign_id": "campaign_abc123",
        "intervention": {
            "do": {
                "kol": {"remove": ["kol_001"], "add": ["kol_003"]},
                "day": 3,
                "budget_realloc": {"kol_001_budget": "kol_003"},
            }
        },
        "rollout_days": 14,
    },
    timeout=120,
).json()

print(counterfactual["roi_diff"])          # ROI change from intervention
print(counterfactual["trajectory_diff"])   # day-by-day path difference
print(counterfactual["attribution"])       # which causal nodes shifted

POST

/api/sandbox/postmortem

— Platform counterfactual

import httpx

postmortem = httpx.post(
    "http://localhost:8001/api/sandbox/postmortem",
    json={
        "actuals": {
            "campaign_id": "q2_campaign",
            "spend": {"xhs": 200000, "douyin": 300000},
            "observed_roi": 1.4,
        },
        "counterfactual_alloc": {"xhs": 1.0, "douyin": 0.0},  # what if all on XHS?
    },
    timeout=120,
).json()

print(postmortem["counterfactual_roi"])   # what ROI would have been
print(postmortem["delta"])                # difference from actuals

GET

/api/adapters

— List available platform adapters

import httpx
adapters = httpx.get("http://localhost:8001/api/adapters").json()
# Returns: ["xhs_v1", "tiktok_agent", "douyin", ...]

Python SDK Usage (Direct Engine)

For programmatic use without the HTTP layer:

from oransim.world_model import AgentSociety
from oransim.causal import CausalGraph, do_operator
from oransim.diffusion import HawkesRollout

# 1. Build the causal graph
graph = CausalGraph.from_config("configs/default_graph.yaml")

# 2. Initialize virtual consumer society
society = AgentSociety(
    n_agents=10_000,        # scale down from 1M for local dev
    vertical="beauty",
    platform="xhs",
    llm_mode="mock",        # "mock" | "api"
)

# 3. Define campaign
campaign = {
    "budget": 200_000,
    "kols": [{"id": "kol_001", "tier": "mid", "fans": 150_000}],
    "creative_ids": ["vid_A"],
    "duration_days": 14,
}

# 4. Run baseline simulation
baseline = HawkesRollout(graph=graph, society=society)
result = baseline.run(campaign, n_simulations=50)
print(f"P50 ROI: {result.roi.p50:.2f}")

# 5. Apply do()-operator intervention
with do_operator(graph) as intervened_graph:
    intervened_graph.set("kol_assignment", "kol_002")
    intervened_graph.set("intervention_day", 3)

    counterfactual = HawkesRollout(graph=intervened_graph, society=society)
    cf_result = counterfactual.run(campaign, n_simulations=50)

print(f"Counterfactual P50 ROI: {cf_result.roi.p50:.2f}")
print(f"Delta: {cf_result.roi.p50 - result.roi.p50:.2f}")

Pre-launch ROI Ranking (All Combinations)

from itertools import product
from oransim.world_model import AgentSociety
from oransim.causal import CausalGraph
from oransim.diffusion import HawkesRollout
import pandas as pd

graph = CausalGraph.from_config("configs/default_graph.yaml")
society = AgentSociety(n_agents=5_000, vertical="beauty", platform="xhs", llm_mode="mock")

creatives = ["vid_A", "vid_B", "vid_C", "vid_D"]
kol_lists = [["kol_001"], ["kol_002"], ["kol_003"]]
budgets = [200_000, 500_000]

results = []
for creative, kols, budget in product(creatives, kol_lists, budgets):
    campaign = {"budget": budget, "kols": kols, "creative_ids": [creative], "duration_days": 14}
    rollout = HawkesRollout(graph=graph, society=society)
    r = rollout.run(campaign, n_simulations=30)
    results.append({
        "creative": creative,
        "kol": kols[0],
        "budget": budget,
        "roi_p35": r.roi.p35,
        "roi_p50": r.roi.p50,
        "roi_p65": r.roi.p65,
    })

df = pd.DataFrame(results).sort_values("roi_p50", ascending=False)
print(df.head(5).to_string())   # top 5 combinations

Common Patterns

Pattern 1: Mock mode for CI / testing

import os
os.environ["LLM_MODE"] = "mock"

from oransim.world_model import AgentSociety
society = AgentSociety(n_agents=100, vertical="beauty", platform="xhs", llm_mode="mock")
# All LLM calls return deterministic stubs — fast, free, reproducible

Pattern 2: Check if backend is in mock mode

import httpx
health = httpx.get("http://localhost:8001/health").json()
if health.get("llm_mode") == "mock":
    print("WARNING: Running in mock mode — LLM features are stubs")

Pattern 3: Inspect a prediction's causal path

result = httpx.post("http://localhost:8001/api/predict", json=payload).json()

# Every prediction includes which causal nodes fired
for node in result["causal_path"]:
    print(f"{node['id']:30s}  weight={node['weight']:.3f}  layer={node['layer']}")

Pattern 4: Load the LightGBM quantile baseline (fast mode)

import pickle, numpy as np

with open("models/lgbm_quantile_baseline.pkl", "rb") as f:
    model = pickle.load(f)

# Feature vector: [budget, n_kols, avg_fans, duration_days, platform_enc]
X = np.array([[500_000, 2, 150_000, 14, 0]])   # 0=xhs, 1=douyin
p35, p50, p65 = model.predict(X)
print(f"ROI P35={p35[0]:.2f}  P50={p50[0]:.2f}  P65={p65[0]:.2f}")

Project Structure

oransim/
├── oransim/
│   ├── api.py                  # FastAPI app + god-file (being refactored to api_routers/)
│   ├── api_routers/            # Split routers: predict, sandbox, graph, adapters
│   ├── causal/                 # SCM, do()-operator, 64-node graph, Pearl 3-step
│   ├── world_model/            # AgentSociety, IPF population synthesis, soul personas
│   ├── diffusion/              # Causal Neural Hawkes Process rollout (14-day)
│   └── adapters/               # Platform adapters: xhs_v1, tiktok_agent, douyin, ...
├── frontend/
│   ├── index.html
│   └── js/                     # Modular JS: hero, tabs, cascade animation
├── configs/
│   └── default_graph.yaml      # 64 nodes / 117 edges causal graph definition
├── models/
│   └── lgbm_quantile_baseline.pkl
├── data/                       # 21k-note OSS demo corpus
├── docs/
│   └── en/quickstart.md
└── .env.example

Troubleshooting

Backend returns mock data even with API key set

Check the yellow banner in the frontend. Verify env vars are exported:

echo $LLM_MODE    # should be "api"
echo $LLM_API_KEY # should be non-empty
# Restart the server after setting env vars — uvicorn reads them at startup

ModuleNotFoundError: oransim

Install in editable mode from the repo root:

pip install -e '.[dev]'

Simulation times out (> 120s)

Reduce agent count or use fast mode:

# In payload:
{"mode": "fast", "n_simulations": 30}
# Or reduce society size in direct SDK usage:
AgentSociety(n_agents=1_000, ...)

CORS errors when calling API from browser

The FastAPI app includes CORS middleware for

localhost:8090

# In oransim/api.py, update the origins list or set:
CORS_ORIGINS=http://localhost:YOUR_PORT uvicorn oransim.api:app --port 8001

Counterfactual returns identical result to baseline

In mock mode this is expected — stubs are deterministic. Switch to

LLM_MODE=api

Enterprise data access (4.3M+ 小红书 notes, 2.1M+ creators)

The OSS corpus is 21k notes. For production-scale data:

• Browse: datacenter.oran.cn
• Contact:

  cto@orannai.com

Key Concepts

do()

LLM_MODE=api