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it is simply: cv2.BRISK_create()

>>> help(cv2.BRISK_create)
Help on built-in function BRISK_create:

BRISK_create(...)
    BRISK_create([, thresh[, octaves[, patternScale]]]) -> retval
    .   @brief The BRISK constructor
    .
    .   @param thresh AGAST detection threshold score.
    .   @param octaves detection octaves. Use 0 to do single scale.
    .   @param patternScale apply this scale to the pattern used for sampling the neighbourhood of a
    .   keypoint.



    BRISK_create(radiusList, numberList[, dMax[, dMin[, indexChange]]]) -> retval
    .   @brief The BRISK constructor for a custom pattern
    .
    .   @param radiusList defines the radii (in pixels) where the samples around a keypoint are taken (for
    .   keypoint scale 1).
    .   @param numberList defines the number of sampling points on the sampling circle. Must be the same
    .   size as radiusList..
    .   @param dMax threshold for the short pairings used for descriptor formation (in pixels for keypoint
    .   scale 1).
    .   @param dMin threshold for the long pairings used for orientation determination (in pixels for
    .   keypoint scale 1).
    .   @param indexChange index remapping of the bits.