Distance Metrics¶
Distance measures
Module Documentation¶
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fitr.criticism.distance.
likelihood_distance
(loglik_func, data, params, diff_metric='sq', dist_metric='cosine', verbose=False)¶ Estimates the likelihood of the data from the i’th subject using the parameter estimates of the j’th subject, for all i and j, then computes the distance between subjects’ likelihood difference vectors
Parameters: - loglik_func : function
The log-likelihood function to be used
- data : dict
Data formatted for input into the log-likelihood function
- params : ndarray(shape=(nsubjects, nparams))
Array of parameter estimates
- diff_metric : {‘sq’, ‘diff’, ‘abs’}
Which type of difference measure to compute, ‘diff’ is simple subtractive difference, whereas ‘sq’ and ‘abs’ are the squared and absolute differences, respectively
- dist_metric : str (default=’cosine’)
The pairwise distance metric to use. Any option that can be passed into
sklearn.metrics.pairwise_distances
can work.- verbose : bool
Whether to print out progress
Returns: - ndarray(shape=(nsubjects, nsubjects))
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fitr.criticism.distance.
parameter_distance
(params, dist_metric='canberra', scale='minmax', return_scaled=False)¶ Computes distances between subjects’ respective parameter estimates
Parameters: - params : ndarray(shape=(nsubjects, nsubjects))
Array of parameter estimates
- dist_metric : str (default=’canberra’)
Distance metric to be used. Can take any value acceptable by
sklearn.metrics.pairwise_distances
.- scale : {‘minmax’, ‘standard’, ‘none’}
How to scale the parameters for distance computation
- return_scaled : bool
Whether to return scaled parameters