comparison examples/Automatic Music Transcription/SMALL_AMT_SPAMS_test.m @ 6:f72603404233

(none)

+%%  DICTIONARY LEARNING FOR AUTOMATIC MUSIC TRANSCRIPTION EXAMPLE 1
+%   This file contains an example of how SMALLbox can be used to test diferent
+%   dictionary learning techniques in Automatic Music Transcription problem.
+%   It calls generateAMT_Learning_Problem that will let you to choose midi,
+%   wave or mat file to be transcribe. If file is midi it will be first
+%   converted to wave and original midi file will be used for comparison with
+%   results of dictionary learning and reconstruction.
+%   The function will generarte the Problem structure that is used to learn
+%   Problem.p notes spectrograms from training set Problem.b using
+%   dictionary learning technique defined in DL structure.
+%
+%   Ivan Damnjanovic 2010
+%%
+
+clear;
+
+
+% Defining Automatic Transcription of Piano tune as Dictionary Learning
+% Problem
+
+SMALL.Problem = generateAMT_Learning_Problem();
+TPmax=0;
+%%
+for i=1:10
+    %%
+    %   Solving AMT problem using non-negative sparse coding with
+    %   SPAMS online dictionary learning (Julien Mairal 2009)
+    %
+    
+    %   Initialising Dictionary structure
+    %   Setting Dictionary structure fields (toolbox, name, param, D and time)
+    %   to zero values
+    
+    SMALL.DL(i)=SMALL_init_DL();
+    
+    %   Defining fields needed for dictionary learning
+    
+    SMALL.DL(i).toolbox = 'SPAMS';
+    SMALL.DL(i).name = 'mexTrainDL';
+    
+    %   We test SPAMS for ten different values of parameter lambda
+    %   Type 'help mexTrainDL in MATLAB prompt for explanation of parameters.
+    
+    lambda(i)=1.4+0.2*i;
+    
+    SMALL.DL(i).param=struct(...
+        'K', SMALL.Problem.p,...
+        'lambda', lambda(i),...
+        'iter', 300,...
+        'posAlpha', 1,...
+        'posD', 1,...
+        'whiten', 0,...
+        'mode', 2);
+    
+    %   Learn the dictionary
+    
+    SMALL.DL(i) = SMALL_learn(SMALL.Problem, SMALL.DL(i));
+    
+    %   Set SMALL.Problem.A dictionary and reconstruction function
+    %   (backward compatiblity with SPARCO: solver structure communicate
+    %   only with Problem structure, ie no direct communication between DL and
+    %   solver structures)
+    
+    SMALL.Problem.A = SMALL.DL(i).D;
+    SMALL.Problem.reconstruct=@(x) SMALL_midiGenerate(x, SMALL.Problem);
+    
+    
+    %%
+    %   Initialising solver structure
+    %   Setting solver structure fields (toolbox, name, param, solution,
+    %   reconstructed and time) to zero values
+    %   As an example, SPAMS (Julien Mairal 2009) implementation of LARS
+    %   algorithm is used for representation of training set in the learned
+    %   dictionary.
+    
+    SMALL.solver(1)=SMALL_init_solver;
+    
+    %   Defining the parameters needed for sparse representation
+    
+    SMALL.solver(1).toolbox='SPAMS';
+    SMALL.solver(1).name='mexLasso';
+    
+    %   Here we use mexLasso mode=2, with lambda=3, lambda2=0 and positivity
+    %   constrain (type 'help mexLasso' for more information about modes):
+    %
+    %   min_{alpha_i} (1/2)||x_i-Dalpha_i||_2^2 + lambda||alpha_i||_1 + (1/2)lambda2||alpha_i||_2^2
+    
+    SMALL.solver(1).param=struct(...
+        'lambda', 3,...
+        'pos', 1,...
+        'mode', 2);
+    
+    %   Call SMALL_soolve to represent the signal in the given dictionary.
+    %   As a final command SMALL_solve will call above defined reconstruction
+    %   function to reconstruct the training set (Problem.b) in the learned
+    %   dictionary (Problem.A)
+    
+    SMALL.solver(1)=SMALL_solve(SMALL.Problem, SMALL.solver(1));
+    
+    %%
+    %   Analysis of the result of automatic music transcription. If groundtruth
+    %   exists, we can compare transcribed notes and original and get usual
+    %   True Positives, False Positives and False Negatives measures.
+    
+    AMT_res(i) = AMT_analysis(SMALL.Problem, SMALL.solver(1));
+    if AMT_res(i).TP>TPmax
+        TPmax=AMT_res(i).TP;
+        BLmidi=SMALL.solver(1).reconstructed.midi;
+        writemidi(SMALL.solver(1).reconstructed.midi, ['testL',i,'.mid']);
+        max=i;
+    end
+end %end of for loop
+%%
+% Plot results and save midi files
+
+figAMTbest=SMALL_AMT_plot(SMALL, AMT_res(max));
+
+resFig=figure('Name', 'Automatic Music Transcription SPAMS lambda TEST');
+
+subplot (3,1,1); plot(lambda(:), [AMT_res(:).TP], 'ro-');
+title('True Positives vs lambda');
+
+subplot (3,1,2); plot(lambda(:), [AMT_res(:).FN], 'ro-');
+title('False Negatives vs lambda');
+
+subplot (3,1,3); plot(lambda(:), [AMT_res(:).FP], 'ro-');
+title('False Positives vs lambda');
+
+FS=filesep;
+[pathstr1, name, ext, versn] = fileparts(which('SMALLboxSetup.m'));
+cd([pathstr1,FS,'results']);
+[filename,pathname] = uiputfile({' *.mid;' },'Save midi');
+if filename~=0 writemidi(BLmidi, [pathname,FS,filename]);end
+[filename,pathname] = uiputfile({' *.fig;' },'Save figure TP/FN/FP vs lambda');
+if filename~=0 saveas(resFig, [pathname,FS,filename]);end
+
+[filename,pathname] = uiputfile({' *.fig;' },'Save BEST AMT figure');
+if filename~=0 saveas(figAMTbest, [pathname,FS,filename]);end
+
+