Progressively smaller steps are used for larger floating point types.
The default relative step will be np.float64. However, if x0 or f0 are smaller floating point types (np.float16, np.float32), then the smallest floating point type is chosen.
dtype of function evaluation
dtype of parameter vector
relative step size. May be np.float16, np.float32, np.float64
Calculates relative EPS step to use for a given data type and numdiff step method.
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SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
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