Algorithm Composition Roadmap Ideas

[marksweiss]

Note

• DONE Implement storage as numpy array
• DONE Modify core attributes to:
  • retain existing accessors
  • store values in numpy array indexes
  • use CONSTS for the slots
  • store everything as float and convert instrument to int when get() called

Sequence

• DONE Retain existing accessor, iterator and range support
• DONE Add attribute which is a 2D numpy matrix, a sequence Notes
• DONE Use CONSTS for the slots
• DONE Extend validation to check shape of Notes being added
• DONE Add attribute which is a list of child Sequences
• DONE Support hierarchical traversal and apply from the subtree rooted at a Sequence, by DFS over all children
• Add overloaded operator support to apply one Sequence to another as matrix operations
  • add
  • sub
  • mult
  • dot product
• Port existing special purpose transformations, such as transpose, key change, swing and meter change

Generators

• Add base class: defines generate() method taking no input and returning Sequence
• Extend to support attribute which is a 2D numpy matrix, a sequence Notes stored as a matrix
• Use CONSTS for the slots
• Build up library based on different algorithms, e.g. random, by key, all one pitch, etc.

Modifiers

• Add base class: defines transform() method taking Sequence as input and returning Sequence, pure function
• Extend to support attribute which is a 2D numpy matrix, a sequence of Notes stored as a matrix
• Use CONSTS for the slots
• Add pipeline support to build DAGs with Sequence or Generator (returns a Sequence) at the source, and pipe support to chain any number of Modifiers after that and then return a Sequence, pure function
  • Combine with support for hierarchical Sequences
  • The idea is to be able to define arbitrary sequences and sub-sequences of Notes, and to apply arbitrary chains of transformations over them, all efficiently in vector space

Misc

• Crib actual musical generator and transformation algo ideas from:
  • https://github.com/gogins/csound-extended/tree/develop/CsoundAC
  • http://www.flexatone.org/static/docs/athenacl/athenaclManual.pdf
  • http://commonmusic.sourceforge.net/cm/res/doc/cm.html