Release v1.5

• New model type: Direct Models. Direct Models directly correlate current state and future load to time of event, rather than state-transition models which simulate forward to calculate time of event
• New model types that combine multiple models:
  • EnsembleModel: combinations of multiple models of the same system where results are aggregated
  • CompositeModel: combinations of models of different systems that are interdependent
• New Model: Aircraft flight model
• New DataModel: Polynomial Chaos Expansion (PCE) Direct Surrogate model
• Initial transition of Input/State/OutputContainer and SimResult to use Pandas DataFrame. This release will bring the interface more in compliance with DataFrames. v1.6 will fully transition the classes to DataFrames.
• Implemented new metrics that can be used when calculating error: Root Mean Square Error (RMSE), Maximum Error (MAX_E), Mean Absolute Error (MAE), Mean Absolute Percentage Error (MAPE), and Dynamic Time Warping (DTW)
  • Error calculation metric can now be changed in estimate_params
• Revamping integration:
  • New integration methods: RK4 and methods from scipy.integrate
  • Integration is now set at the model level. For continuous models the specified integration method will apply when calling next_state
• 3.11 support

Release schedule (updated 6/1):

• Release Branch Opens: June 16, 2023
• Release Review: June 23, 2023
• Release Date: June 26, 2023