Any model developed in AnyLogic is a Java application that can be customized natively using the Java programming language. However, it is possible to introduce Python as an auxiliary programming language within your models, enabling the opportunity to use Python-based libraries and algorithms.
The Pypeline library can be used for:
It’s compatible with AnyLogic with any valid license (Personal Learning Edition, University, or Professional) and any version of Python 3 (except from the Windows store) installed on your computer.
To help data transfer between your Python and AnyLogic (Java) environments, Pypeline also comes with features to convert data objects to and from the JSON format. It is an open standard file format and data interchange format that is friendly to parse for both humans and computers.
AnyLogic models can access Python code using the Pypeline library. Conversely, to launch an AnyLogic model from Python code, developers can use the AnyLogic Cloud API or the Alpyne library.
The AnyLogic Company has developed Pypeline as a third-party library that is free, open source, and an optional connectivity tool, without obligation to provide official support or promise of compatibility of any kind. Users of the library may ask questions or provide comments on the Issue or Discussion tabs of the GitHub page.
This webinar offers a comprehensive introduction to Pypeline. The presentation begins with an explanation of its definition and diverse use cases. This is followed by an in-depth technical exploration, demonstrating how to optimally integrate Pypeline into simulation models. For the latest updates, including new settings and features, please refer to the project's GitHub repository.
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The examples below demonstrate various Pypeline library use cases and levels of complexity; they are available from the GitHub repository and the internal repository of models shipped with any edition of AnyLogic (AnyLogic welcome screen → Example models → How-to models/Examples).
This is an introductory demo in which you can explore the basic functionality that Pypeline provides in three different functions – “run”, “runResults”, and “runFile”.
Unlike any other model, it’s set up to allow you to interactively configure the PyCommunicator object and to send or receive information to or from the underlying Python environment. In this demo, major features are shown to give a hands-on introduction to using Pypeline.
This model depicts a simplified hospital where patients arrive, stay for some time, and then leave. Two neural networks are utilized: one for predicting the arrival rate of patients based on the last days’ worth of arrival rates, and a second for predicting patient length of stay based on 24 health-related attributes of the individual.
This is a model of a 3-echelon supply chain for a single product. Customers request varying amounts of the product weekly from factories, which can store them in warehouses.
The model includes costs associated with transporting the product between the three levels of the supply chain. The supply chain is imported from an Excel file to the database on startup. At the start of each week, the current model state is sent to a Python optimizer to determine how much product to send and to whom.
This model showcases an example of a Traveling Salesman problem (TSP). In the TSP, a set of cities are present, with one designated as the home location.
Given an arbitrary number of cities to visit, the goal is to find the shortest route that starts and ends at the home location. To optimize the order, the Python library OR-tools (by Google) is used.
This model is a slightly modified version of the original AnyLogic example model. The original one is a System Dynamics model demonstrating a chaotic yet deterministic system. When the model starts, Pypeline will spawn a new 3D window (via the Python library “MatPlotLib”) and begin streaming data to it.
You can interact with it by dragging the 3D graph to view the model from different angles or by changing the sliders in the simulation and viewing the results. This model also demonstrates Pypeline’s ability to function in parallel simulations without any extra code.
This model is a slightly modified version of the original AnyLogic example model “Interconnected Call Centers”. It shows how to use dashboard libraries - "Dash" library in this case - to build a live web app for the executing model.
After launching the model, the web app will be launched in a background Python environment. You can open a new browser tab to "localhost:8050" to view it. Periodically, the model will transmit its current state to Python, which will then update the web app. You can use this strategy to create alternative interfaces for analyzing your model as it runs.
This model demonstrates a basic use case of the JSON features built into Pypeline. These include the ability to serialize model objects to JSON (either to transfer data to Python or for logging purposes) and the ability to deserialize JSON text to agents and populations.
The serialization features are also shown to be customized through a built-in filter object. The set of JSON features comes from an AnyLogic JSONifier library built into Pypeline.
This model demonstrates solving static optimization using the Python libraries Numpy and Scipy. In the model, there are three types of machines; each has its own production cost and is built in three stages, with each stage having a different time requirement per stage.
There are two constraints: the allotted number of machines built and the cumulative time allotted for each stage. The goal is to change the number of each type built so that the production cost is minimized.
This is a proof-of-concept model for how to use Pypeline’s PyCommunicator object from within an experiment. Although the PyCommunicator object is technically an agent, by initializing it from certain experiment action fields, Python can be called upon to, in this example, generate the next values in a parameter variation experiment.
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