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  Central to the package is the AIF object. This is a structure containing all the components of 
  the generative model, as well as the dynamic belief states and the various settings needed to 
  perform AIF, and is used in conjunction with most of the high-level functions of the package. 
  An AIF object can be created with the init_aif function, which takes as arguments the 
  components of the generative model and a dictionary of various settings and parameters: 