Isomorph2026/isomorph-supply-chain-sample

ISOMORPH Sample是ISOMORPH发布版的一个单次运行子集，旨在让用户在下载完整数据集前检查文件格式和运行加载器。该数据集包含由多级供应链数字孪生模拟器生成的多元物流时间序列数据，模拟器基于有向路由图（包含工厂、中间仓库和面向客户的目的地）和马尔可夫链动态。在离散时间步长中，模拟器处理随机泊松客户需求，并通过网络触发补货。需求强度由年度季节性、周度季节性、AR(1)漂移、每项突发和共享宏观冲击五个组件求和而成。状态向量记录每个位置每项物品的现有库存、积压订单、未完成订单、在途运输和平滑需求估计。发布的运行基于一个13节点美国拓扑（3个源、9个跨5层的仓库、纽约市目的地），具体参数包括：家族为baseline，目录大小50项，时间范围52,560天，种子2025，磁盘大小约1.9 GB。

ISOMORPH Sample is a single-rollout subset of the ISOMORPH release, intended for users who want to inspect file formats and run loaders before pulling the full dataset. It contains multivariate logistics time-series data generated by a digital-twin simulator of a multi-echelon supply chain with an explicit routing network, formulated as a Markov chain. The simulator advances a directed routing graph of factories, warehouses, and a destination in discrete time, with random Poisson customer demand and Gaussian source lead times as random inputs. Demand intensity is a five-component sum: yearly seasonality, weekly seasonality, AR(1) drift, per-item bursts, and a shared macro shock. The state vector records on-hand stock, backlog, outstanding orders, in-transit shipments, and a smoothed demand estimate for every item at every location. The released rollout runs on a 13-node US topology (3 sources, 9 warehouses across 5 tiers, NYC destination), with parameters: family baseline, catalogue size 50 items, horizon 52,560 days, seed 2025, and approximate on-disk size ~1.9 GB.