diff kpca.py @ 0:e9ebd4bfbdfc draft

Imported from capsule None

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kpca.py	Mon May 19 12:34:31 2014 -0400
@@ -0,0 +1,134 @@
+#!/usr/bin/env python
+
+"""
+Run kernel PCA using kpca() from R 'kernlab' package
+
+usage: %prog [options]
+   -i, --input=i: Input file
+   -o, --output1=o: Summary output
+   -p, --output2=p: Figures output
+   -c, --var_cols=c: Variable columns
+   -k, --kernel=k: Kernel function
+   -f, --features=f: Number of principal components to return
+   -s, --sigma=s: sigma
+   -d, --degree=d: degree
+   -l, --scale=l: scale
+   -t, --offset=t: offset
+   -r, --order=r: order
+
+usage: %prog input output1 output2 var_cols kernel features sigma(or_None) degree(or_None) scale(or_None) offset(or_None) order(or_None)
+"""
+
+import sys, string
+from rpy import *
+import numpy
+from bx.cookbook import doc_optparse
+
+
+def stop_err(msg):
+    sys.stderr.write(msg)
+    sys.exit()
+
+#Parse Command Line
+options, args = doc_optparse.parse( __doc__ )
+#{'options= kernel': 'rbfdot', 'var_cols': '1,2,3,4', 'degree': 'None', 'output2': '/afs/bx.psu.edu/home/gua110/workspace/galaxy_bitbucket/database/files/000/dataset_260.dat', 'output1': '/afs/bx.psu.edu/home/gua110/workspace/galaxy_bitbucket/database/files/000/dataset_259.dat', 'scale': 'None', 'offset': 'None', 'input': '/afs/bx.psu.edu/home/gua110/workspace/galaxy_bitbucket/database/files/000/dataset_256.dat', 'sigma': '1.0', 'order': 'None'}
+
+infile = options.input
+x_cols = options.var_cols.split(',')
+kernel = options.kernel
+outfile = options.output1
+outfile2 = options.output2
+ncomps = int(options.features)
+fout = open(outfile,'w')
+
+elems = []
+for i, line in enumerate( file ( infile )):
+    line = line.rstrip('\r\n')
+    if len( line )>0 and not line.startswith( '#' ):
+        elems = line.split( '\t' )
+        break 
+    if i == 30:
+        break # Hopefully we'll never get here...
+
+if len( elems )<1:
+    stop_err( "The data in your input dataset is either missing or not formatted properly." )
+
+x_vals = []
+
+for k,col in enumerate(x_cols):
+    x_cols[k] = int(col)-1
+    x_vals.append([])
+
+NA = 'NA'
+skipped = 0
+for ind,line in enumerate( file( infile )):
+    if line and not line.startswith( '#' ):
+        try:
+            fields = line.strip().split("\t")
+            for k,col in enumerate(x_cols):
+                try:
+                    xval = float(fields[col])
+                except:
+                    #xval = r('NA')
+                    xval = NaN#
+                x_vals[k].append(xval)
+        except:
+            skipped += 1
+
+x_vals1 = numpy.asarray(x_vals).transpose()
+dat= r.list(array(x_vals1))
+
+print r('library("kernlab")')
+
+try:
+    r.suppressWarnings(r.library('kernlab'))
+except:
+    stop_err('Missing R library kernlab')
+            
+set_default_mode(NO_CONVERSION)
+if kernel=="rbfdot" or kernel=="anovadot":
+    pars = r.list(sigma=float(options.sigma))
+elif kernel=="polydot":
+    pars = r.list(degree=float(options.degree),scale=float(options.scale),offset=float(options.offset))
+elif kernel=="tanhdot":
+    pars = r.list(scale=float(options.scale),offset=float(options.offset))
+elif kernel=="besseldot":
+    pars = r.list(degree=float(options.degree),sigma=float(options.sigma),order=float(options.order))
+elif kernel=="anovadot":
+    pars = r.list(degree=float(options.degree),sigma=float(options.sigma))
+else:
+    pars = r.list()
+    
+try:
+    kpc = r.kpca(x=r.na_exclude(dat), kernel=kernel, kpar=pars, features=ncomps)
+except RException, rex:
+    stop_err("Encountered error while performing kPCA on the input data: %s" %(rex))
+set_default_mode(BASIC_CONVERSION)
+    
+eig = r.eig(kpc)
+pcv = r.pcv(kpc)
+rotated = r.rotated(kpc)
+
+comps = eig.keys()
+eigv = eig.values()
+for i in range(ncomps):
+    eigv[comps.index('Comp.%s' %(i+1))] = eig.values()[i]
+
+print >>fout, "#Component\t%s" %("\t".join(["%s" % el for el in range(1,ncomps+1)]))
+
+print >>fout, "#Eigenvalue\t%s" %("\t".join(["%.4g" % el for el in eig.values()]))
+    
+print >>fout, "#Principal component vectors\t%s" %("\t".join(["%s" % el for el in range(1,ncomps+1)]))
+for obs,val in enumerate(pcv):
+    print >>fout, "%s\t%s" %(obs+1, "\t".join(["%.4g" % el for el in val]))
+
+print >>fout, "#Rotated values\t%s" %("\t".join(["%s" % el for el in range(1,ncomps+1)]))
+for obs,val in enumerate(rotated):
+    print >>fout, "%s\t%s" %(obs+1, "\t".join(["%.4g" % el for el in val]))
+
+r.pdf( outfile2, 8, 8 )
+if ncomps != 1:
+    r.pairs(rotated,labels=r.list(range(1,ncomps+1)),main="Scatterplot of rotated values")
+else:
+    r.plot(rotated, ylab='Comp.1', main="Scatterplot of rotated values")
+r.dev_off()
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