data.py

import itertools
from midi_to_statematrix import upperBound, lowerBound

def startSentinel():
    def noteSentinel(note):
        position = note
        part_position = [position]
        
        pitchclass = (note + lowerBound) % 12
        part_pitchclass = [int(i == pitchclass) for i in range(12)]
        
        return part_position + part_pitchclass + [0]*66 + [1] 
    return [noteSentinel(note) for note in range(upperBound-lowerBound)]

def getOrDefault(l, i, d):
    try:
        return l[i]
    except IndexError:
        return d

def buildContext(state):
    context = [0]*12
    for note, notestate in enumerate(state):
        if notestate[0] == 1:
            pitchclass = (note + lowerBound) % 12
            context[pitchclass] += 1
    return context
    
def buildBeat(time):
    return [2*x-1 for x in [time%2, (time//2)%2, (time//4)%2, (time//8)%2]]

def noteInputForm(note, state, context, beat):
    position = note
    part_position = [position]

    pitchclass = (note + lowerBound) % 12
    part_pitchclass = [int(i == pitchclass) for i in range(12)]
    # Concatenate the note states for the previous vicinity
    part_prev_vicinity = list(itertools.chain.from_iterable((getOrDefault(state, note+i, [0,0]) for i in range(-12, 13))))

    part_context = context[pitchclass:] + context[:pitchclass]

    return part_position + part_pitchclass + part_prev_vicinity + part_context + beat + [0]

def noteStateSingleToInputForm(state,time):
    beat = buildBeat(time)
    context = buildContext(state)
    return [noteInputForm(note, state, context, beat) for note in range(len(state))]

def noteStateMatrixToInputForm(statematrix):
    # NOTE: May have to transpose this or transform it in some way to make Theano like it
    #[startSentinel()] + 
    inputform = [ noteStateSingleToInputForm(state,time) for time,state in enumerate(statematrix) ]
    return inputform