idyom¶

Loading the system¶

 
CL-USER> (asdf:oos 'asdf:load-op 'idyom) 
... 

You will need to set the value of the variable *root-dir* in the file "apps/apps.lisp": to point to the location of the idyom repository; this is so that files can be saved in the data directory within the repository.

Directory Structure¶

The layout of the code is as follows:

• idyom.asd: the system definition
• utils/: general-purpose utilities
• amuse/: an interface to amuse music data interface
  • amuse-interface.lisp: look here to make this less dependent on amuse-mtp
  • viewpoint-extensions.lisp: extensions to the viewpoint framework useful for modelling
• ppm/: the multiple-viewpoint system modelling framework
  • params.lisp: user-level parameters to the statistical modelling
  • multiple-viewpoint-system.lisp: modelling with multiple-viewpoints
  • prediction-sets.lisp: representing and combining distributions, computing entropy and information content
• apps/: top-level applications for users
  • resampling.lisp: the main user interface - estimating information content by cross-validation
  • viewpoint-selection.lisp: on tin does it says the what
• data/: directory used internally for storing data
  • cache/: for storing cache files
  • models/: for storing model files
  • resampling/: for storing resampling sets

Usage¶

Top-level function MAIN:IDYOM¶

The main workhorse is the function MAIN:IDYOM which accepts the following arguments (the first three are required, the remainder are optional keyword arguments):

Required parameters

• dataset-id: a dataset id
  • e.g., 1
• basic-attributes: a list of basic attributes to predict
  • e.g., '(cpitch bioi)
• attributes: a list of attributes to use in prediction
  • e.g., '((cpintfref cpint) bioi)

Parameters controlling the statistical modelling

• pretraining-ids: a list of dataset-ids to pretrain the long-term models
  • e.g., '(0 1 7)
• k: an integer designating the number of cross-validation folds to use
  • 1 = no cross-validation, but also no training set unless the models are pretrained;
  • :full = as many folds as there are compositions in the dataset
  • default = 10
• resampling-indices: you can limit the modelling to a particular set of resampling folds
• models: whether to use the short-term or long-term models or both
  • :stm - short-term model only
  • :ltm - long-term model only
  • :ltm+ - the long-term model trained incrementally on the test set
  • :both - :stm + :ltm
  • :both+ - :stm + :ltm+ (this is the default)
• ltm-order-bound: the order bound for the long-term model (the default nil means no order bound, otherwise an integer indicates the bound in number of events)
• ltm-mixtures: whether to use mixtures for the LTM (default t)
• ltm-update-exclusion: whether to use update exclusion for the LTM (default nil)
• ltm-escape: the escape method to use for the LTM (:a :b :c :d :x - default :c)
• stm-order-bound: the order bound to use for the short-term model (default nil)
• stm-mixtures: whether to use mixtures for the STM (default t)
• stm-update-exclusion: whether to use update exclusion for the STM (default t)
• stm-escape: the escape method for the STM (default :x)

See Pearce [2005, chapter 6] for a description and explanation of these parameters.

Parameters controlling viewpoint selection

• dp: the number of decimal places to use when comparing information contents in viewpoint selection
  • full floating point precision is used if this is nil (the default)
• max-links: the maximum number of links to use when creating linked viewpoints in viewpoint selection
  • the default is 2

Parameters controlling the output

• output-path: a string indicating a directory in which to write the output
  • output is only written to the console if this is nil</nil> * detail: an integer which determines how the information content is averaged in the output: ** 1: averaged over the entire dataset ** 2: and also averaged over each composition ** 3: and also for each event in each composition h3. Subsidiary functions The function <MAIN:IDYOM> in turn passes its arguments on to a number of sub-functions which can be used independently. <code>RESAMPLING:DATASET-PREDICTION</code> accepts the following arguments (all but the first three are optional, keyword arguments): * dataset-id: a dataset id ** e.g., 1 * basic-attributes: a list of basic attributes to predict ** e.g., '(cpitch bioi) * attributes: a list of attributes to use in prediction ** e.g., '((cpintfref cpint) bioi) * pretraining-ids: a list of dataset-ids to pretrain the long-term models ** e.g., '(0 1 7) * k: an integer designating the number of cross-validation folds to use ** 1 = no cross-validation, but also no training set unless the models are pretrained; ** :full = as many folds as there are compositions in the dataset ** default = 10 * resampling-indices: you can limit the modelling to a particular set of resampling folds * models: whether to use the short-term or long-term models or both ** :stm - short-term model only ** :ltm - long-term model only ** :ltm+ - the long-term model trained incrementally on the test set ** :both - :stm + :ltm ** :both+ - :stm + :ltm+ (this is the default) * ltm-order-bound: the order bound for the long-term model (the default <code>nil</code> means no order bound, otherwise an integer indicates the bound in number of events) * ltm-mixtures: whether to use mixtures for the LTM (default <code>t</code>) * ltm-update-exclusion: whether to use update exclusion for the LTM (default <code>nil</code>) * ltm-escape: the escape method to use for the LTM (<code>:a :b :c :d :x</code> - default <code>:c</code>) * stm-order-bound: the order bound to use for the short-term model (default <code>nil</code>) * stm-mixtures: whether to use mixtures for the STM (default <code>t</code>) * stm-update-exclusion: whether to use update exclusion for the STM (default <code>t</code>) * stm-escape: the escape method for the STM (default <code>:x</code>) h3. <code>output-information-content</code> <code>RESAMPLING:OUTPUT-INFORMATION-CONTENT</code> takes the output of <code>RESAMPLING:DATASET-PREDICTION</code> and returns the average information content. It takes the following arguments: * predictions: the output of <code>RESAMPLING:DATASET-PREDICTION</code> * detail: an integer which determines how the information content is averaged (these are returned as multiple values): ** 1: averaged over the entire dataset ** 2: and also averaged over each composition ** 3: and also for each event in each composition h3. <code>format-information-content</code> <code>RESAMPLING:FORMAT-INFORMATION-CONTENT</code> takes the output of <code>RESAMPLING:DATASET-PREDICTION</code> and writes it to file. It takes the following arguments: * predictions: the output of <code>RESAMPLING:DATASET-PREDICTION</code> * file: a string denoting a file * dataset-id: an integer reflecting the dataset-id * detail: an integer which determines how the information content is averaged (these are returned as multiple values): ** 1: averaged over the entire dataset ** 2: and also averaged over each composition ** 3: and also for each event in each composition h2. Examples h3. To get mean information contents for each melody of dataset 0 in a list

    CL-USER> (resampling:output-information-content 
              (resampling:dataset-prediction 0 '(cpitch) '(cpintfref cpint))
              2)
    2.493305
    (2.1368716 2.8534691 2.6938546 2.6491673 2.4993074 2.6098127 2.7728052 2.772861
     2.5921957 2.905856 2.3591626 2.957503 2.4042292 2.7562473 2.3996017 2.8073587
     2.114944 1.7434102 2.2310295 2.6374347 2.361792 1.9476132 2.501488 2.5472867
     2.1056154 2.8225484 2.134257 2.9162033 3.0715692 2.9012227 2.7291088 2.866882
     2.8795822 2.4571223 2.9277062 2.7861307 2.6623116 2.3304622 2.4217033
     2.0556943 2.4048684 2.914848 2.7182267 3.0894585 2.873869 1.8821808 2.640174
     2.8165438 2.5423129 2.3011856 3.1477294 2.655349 2.5216308 2.0667994 3.2579045
     2.573013 2.6035044 2.202191 2.622113 2.2621205 2.3617425 2.7526956 2.3281655
     2.9357266 2.3372407 3.1848125 2.67367 2.1906006 2.7835917 2.6332111 3.206142
     2.1426969 2.194259 2.415167 1.9769101 2.0870917 2.7844474 2.2373738 2.772138
     2.9702199 1.724408 2.473073 2.2464263 2.2452457 2.688889 2.6299863 2.2223835
     2.8082614 2.673671 2.7693706 2.3369458 2.5016947 2.3837066 2.3682225 2.795649
     2.9063463 2.5880773 2.0457468 1.8635312 2.4522712 1.5877498 2.8802161
     2.7988417 2.3125513 1.7245895 2.2404804 2.1694546 2.365556 1.5905867 1.3827317
     2.2706041 3.023884 2.2864542 2.1259797 2.713626 2.1967313 2.5721254 2.5812547
     2.8233812 2.3134546 2.6203637 2.945946 2.601433 2.1920888 2.3732007 2.440137
     2.4291563 2.3676903 2.734724 3.0283954 2.8076048 2.7796154 2.326931 2.1779459
     2.2570527 2.2688026 1.3976555 2.030298 2.640235 2.568248 2.6338177 2.157162
     2.3915367 2.7873137 2.3088667 2.2176988 2.4402564 2.8062992 2.784044 2.4296925
     2.3520193 2.6146257)
    

CL-USER> (resampling:format-information-content 
          (resampling:dataset-prediction 0 '(cpitch) '(cpintfref cpint))
          "/tmp/foo.dat" 
          0
          3)

CL-USER> (resampling:conkwit95)
Simulation of the experiments of Conklin & Witten (1995, Table 4).
System 1; Mean Information Content: 2.33 
System 2; Mean Information Content: 2.36 
System 3; Mean Information Content: 2.09 
System 4; Mean Information Content: 2.01 
System 5; Mean Information Content: 2.08 
System 6; Mean Information Content: 1.90 
System 7; Mean Information Content: 1.88 
System 8; Mean Information Content: 1.86 
NIL

CL-USER> (viewpoint-selection:run-hill-climber 
          '(:cpitch :cpintfref :cpint :contour)
          nil
          #'(lambda (viewpoints)
              (utils:round-to-nearest-decimal-place 
               (resampling:output-information-content 
                (resampling:dataset-prediction 0 '(cpitch) viewpoints :k 10 :models :both+) 
                1)
               2))
          :desc)

 =============================================================================
   System                                                Score
 -----------------------------------------------------------------------------
   NIL                                                   NIL
   (CPITCH)                                              2.52
   (CPINT CPITCH)                                        2.43
   (CPINTFREF CPINT CPITCH)                              2.38
 =============================================================================
#S(VIEWPOINT-SELECTION::RECORD :STATE (:CPINTFREF :CPINT :CPITCH) :WEIGHT 2.38)

(initialise-vs-cache)
(load-vs-cache filename package)
(store-vs-cache filename package)