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In general, the different implementations of Stereo Block Match algorithms are not equivalent. They will not all implement every configuration setting, nor will they return the exact same block match results as each other, bit-for-bit. Each Stereo Block Match implementation may be better or worse for any particular problem to be solved on any particular hardware.
Different capabilities and results for each implementation are expected and it is not a bug. In particular, the GPUs are fast but simplistic machines; if full flexibility - supporting all configuration setting combinations - were added by a contributor, the implementation may become much more complicated and may slow down greatly.
