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thing is, to call help() properly here, you have to create an instance of it

>>> help(cv2.createThinPlateSplineShapeTransformer()) ## () braces matter !!
Help on ThinPlateSplineShapeTransformer object:

class ThinPlateSplineShapeTransformer(ShapeTransformer)
 |  Method resolution order:
 |      ThinPlateSplineShapeTransformer
 |      ShapeTransformer
 |      Algorithm
 |      builtins.object
 |
 |  Methods defined here:
 |
 |  __new__(*args, **kwargs) from builtins.type
 |      Create and return a new object.  See help(type) for accurate signature.
 |
 |  __repr__(self, /)
 |      Return repr(self).
 |
 |  getRegularizationParameter(...)
 |      getRegularizationParameter() -> retval
 |
 |  setRegularizationParameter(...)
 |      setRegularizationParameter(beta) -> None
 |
 |  ----------------------------------------------------------------------
 |  Methods inherited from ShapeTransformer:
 |
 |  applyTransformation(...)
 |      applyTransformation(input[, output]) -> retval, output
 |
 |  estimateTransformation(...)
 |      estimateTransformation(transformingShape, targetShape, matches) -> None
 |
 |  warpImage(...)
 |      warpImage(transformingImage[, output[, flags[, borderMode[, borderValue]]]]) -> output
 |
 |  ----------------------------------------------------------------------
 |  Methods inherited from Algorithm:
 |
 |  clear(...)
 |      clear() -> None
 |
 |  getDefaultName(...)
 |      getDefaultName() -> retval
 |
 |  save(...)
 |      save(filename) -> None