A library of benckmark code corresponding to the paper A Interdisciplinary Survey on Origin-destination Flows Modeling: Theory and Techniques.

Problem Definition. Given the regional urban characteristics of the city ${\lbrace} X_r | r\in\mathcal{R} \rbrace$ and observed OD flows $\lbrace f_{ij}|\langle r_i, r_j\rangle\in\mathcal{X} \rbrace$ between part of OD pairs $\mathcal{X}$ , construct a model to predict the remaining unknown OD flows $\lbrace f_{ij}|\langle r_i,r_j\rangle\notin\mathcal{X}\rbrace$.

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Definition of OD Matrix. The OD flows are organized in the form of an OD matrix $\bf F$ shown below,

$$ \mathbf{F} = \begin{bmatrix} f_{11} & f_{12} & ... & f_{1N} \\ f_{21} & f_{22} & ... & f_{2N} \\ \vdots & \vdots & \ddots & \vdots \\ f_{N1} & f_{N2} & ... & f_{NN} \end{bmatrix}, $$

in which each element represents the flow $f_{ij}$ between a specific pair of regions. An OD matrix generally represents the mobility flow between all regions within an entire city.

Problem Definition. The OD construction problem aims to construct the complete OD matrix $\mathbf{F}$ for the city based on easily accessible information without any OD flow information available.

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Problem Definition. Given a set of observed temporal traffic counts or other relevant observations $\mathcal{T} = \lbrace x_i^t | t=1,..,T \text{ and } i = 1,...,N \rbrace$ collected at various locations $\lbrace l_i | i=1,...,N \rbrace$ within a transportation network (such as road segments, intersections, or sensor-equipped locations), the objective is to infer the underlying OD flows $\lbrace f^t_{ij}\rbrace$, i.e., the number of trips between different origin and destination pairs, that generated the observed traffic pattern.

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Problem Definition. Given a historical dataset of OD flows $\lbrace f^t_{ij} | t= 1,2,...,k-1 \rbrace$ over a certain period of time, the objective is to forecast the OD flows for future time periods $\lbrace f^t_{ij} | t=k,k+1,... \rbrace$.

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