Start of any walk, identifying the type of walk (Image/Bookmarks).
Reimplemented in Impala::Core::ImageSet::ApplyConcepts, Impala::Core::ImageSet::CombineConcepts, Impala::Core::ImageSet::ComputeKernelData, Impala::Core::ImageSet::IndexConcepts, and Impala::Core::ImageSet::InterestPointProc. Definition at line 42 of file Listener.h.
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