d, indicates the fraction (between 0.0 and 1.0) of the total denoising process to be
bypassed before it is initiated. Consequently, the initial part of the denoising process is skipped and
it is assumed that the passed image is a partly denoised image. Note that when this is specified,
strength will be ignored. The denoising_start parameter is particularly beneficial when this pipeline
is integrated into a “Mixture of Denoisers” multi-pipeline 