Blurb::
Specify how the trial samples are generated
Description::
The user has the option to specify the method by which the
trials are created to adjust the centroids. The ``trial_type``
can be one of three types:

- ``random``, where points are generated randomly
- ``halton``, where points are generated according to the Halton sequence
- ``grid``, where points are placed on a regular grid over the hyperspace.
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