diff src/scheme/modelbase.scm @ 0:bf79fb79ee13

Initial Mercurial check in.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scheme/modelbase.scm	Tue Jan 17 17:50:20 2012 +0000
@@ -0,0 +1,72 @@
+;;; these functions handle the model hierarchy: it is notionally
+;;; a multidimensional array. A particular model is a member of
+;;; the product space:
+;;; 	{ sampling-rate x {mono, stereo} x frame-size x ensemble x model-class }
+;;; sampling-rate in { 11kHz, 22kHz, 44kHz }
+;;; frame-size is an integer
+;;; ensemble denotes the set of audio files used to train the model
+;;; model-class is eg, ICA, Gaussian, etc.
+;;; The model classes may have a taxonomic hierarchy, eg, 
+;;;    Gaussian: full covariance, spherical, diagonal, PCA
+;;; and may have finer refinements, eg
+;;;    ICA with exponential prior, cauchy prior, generalised exponential
+;;; In addition, there may be different instances of each model,
+;;; trained at different times using a different realisation of the 
+;;; ensemble.
+;;;
+;;; Of-course, the file system doesn't support multidimensional arrays or
+;;; product spaces: only strict hierarchies, so there needs to be a mapping
+;;; between the two. The order in which the dimensions are arranged is somewhat
+;;; arbitrary and invovles replication of directory names. Hence, these
+;;; functions to automate the whole thing.
+
+(define root "models")		; root defaults to "models" in current directory
+(define (_rate rate)			; return path component for rate
+	(string-append (.toString rate) "kmono"))
+
+(define (_frame fr)
+	(string-append "x" (.toString fr)))
+		
+
+(define (model-path rate frame data class)
+	(define / "/")		; path separator
+	(string-append 
+		root / 
+		(_rate rate) / 
+		data /  
+		(_frame frame) /
+		class /
+	)
+)
+
+;; set up environment for running given model
+(define (push-model rate x class data)
+
+	; compose path for properties file
+	(define model-props (cat (model-path rate (.size x) data class) "args"))		
+	
+	; create new properties object for persistent properties
+	;(define model-env (samer.core.util.Properties. (env) (Node. class (.getNode x))))
+	(define model-env (samer.core.util.Properties. (env) (.getNode x)))
+	
+	; load any previously saved properties
+	(.load model-env (java.io.FileInputStream. model-props))
+	
+	; push an environment for non-persistent objects, with the properties as parent
+	(Shell.push (samer.core.util.HashMap. model-env))	
+	(put "props-file" model-props)		; save the properties file name for later
+	
+	;; should we load a model script here?
+)
+
+(define (pop-model)
+	; current environment should be a  HashMap containing "props-file"
+	; it's parent should be a Properties environment 
+	; so we save the parent environment to the recovered file
+	(.save (.parent (env)) (java.io.FileOutputStream. (get "props-file")))
+	(Shell.pop)		; this will unlink and discard both environments
+)
+
+
+
+