Home
Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
romAI
Post-Processor Tab
The Post-Processor tab lets you visualize and evaluate the trained ROM.
Time Simulation Tab
If romAI is used to generate dynamic ROMs, it is important to have a tool that easily performs preliminary time simulations to assess the accuracy of the transient behavior after the romAI model has been trained.

Welcome
What's New
Discover new features and enhancements.
Get Started
Discover Compose, including its language support and system requirements.
Tutorials
The Compose tutorials and associated example model files help introduce you to the basic functionality of the software.
User Guide
Learn about the features and functionality available in Compose.
Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
- Scripting Guide for OpenMatrix Language
  OpenMatrix is a mathematical scripting language.
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
- Python in Compose Reference Guide
- romAI
  - Introduction
    romAI is an application that is comprised of libraries from the Altair Composeand Altair Twin Activate software products.
  - Design Fundamentals
    romAI serves two purposes.
  - Theoretical Framework
    Some system theory terminology must be understood.
  - ROM Framework
  - Workflow
    The typical workflow has four steps.
  - Installation
    The romAI tool is enabled through Extension Manager.
  - GUI
    The first steps of the workflow are accomplished through the GUI.
  - Pre-Processor Tab
    The Pre-Processor tab contains the optional pre-processing step.
  - Builder Tab
    The Builder tab facilitates the training step.
  - Post-Processor Tab
    The Post-Processor tab lets you visualize and evaluate the trained ROM.
    - Check Loss
      View the overall training, validation, and test loss.
    - Check Accuracy
      The R² Accuracy check is applicable only for static models.
    - Define Hyper Planes
    - Time Simulation Tab
      If romAI is used to generate dynamic ROMs, it is important to have a tool that easily performs preliminary time simulations to assess the accuracy of the transient behavior after the romAI model has been trained.
    - Instance Evaluation Tab
      romAI can be used to generate static ROMs.
    - Report Generation
      The report generation tools can be accessed from Tools menu.
  - ROM Generation Tips
  - Batch Training
    The training procedure can be carried over without using the GUI.
  - Batch Execution
    The simulation and evaluation of a romAI model can be also done via batch in the Compose OML editor without the need to deploy the trained romAI model into a Twin Activate block, using the romAI_execute function.
  - Frequently Asked Questions
Appendix
Get help for the optional libraries that are available in the Extension Manager.
Frequently Asked Questions
You've got questions? We've got answers!

Time Simulation Tab

If romAI is used to generate dynamic ROMs, it is important to have a tool that easily performs preliminary time simulations to assess the accuracy of the transient behavior after the romAI model has been trained.

The Time Simulation tab has been designed to perform these time simulations in just one step.

Use the Import

icon to select a dataset file, if not already selected. The selected dataset file name can be seen in the file name info section at the bottom of the dialog box.

Note: The format and labels in the dataset file are the same as those in the training file.

A time simulation is triggered. After the simulation runs successfully, the plot is updated.

The following are drawn in the plot:

Blue line: The dynamical results produced by the romAI model, given the inputs and the initial state conditions that are contained in the dataset file.
Green line: The target time history.
RMSE Metric: Root Mean Square Error calculated between the two signals is shown in the legend.
Note: The RMSE is calculated for the segment and output currently active.

Use the list box to select the output of the romAI model that you want to plot.

If the loaded dataset file contains multiple time histories, you can select the desired history in the segments list box beside the output list box.