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object --+ | dict --+ | EquivalenceMap
A mapping from some of the morph entries to others via a root change.
These define entries that can be considered equivalent to another entry given a change of root. These exist to deal with inversions that show up in chord sequences as different chords.
E.g., a diminished chord may be written as if any of its notes are the root, but this decision is made mainly on the basis of what is easiest to read. Categories must be included to handle each case for the chord grammar, but only one is required for a model that can recognise inversions itself, such as a MIDI model.
Here we tell such models how to construct a smaller set of categories, so that they can understand annotated chord data.
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x.__init__(...) initializes x; see help(type(x)) for signature
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