made pyFFTW optional

confidenceMapUtil/FDRutil.py

@@ -4,8 +4,7 @@ import math
 import gc
 import os
 import sys
-import pyfftw
-import multiprocessing
+
 
 #Author: Maximilian Beckers, EMBL Heidelberg, Sachse Group
 
@@ -530,20 +529,23 @@ def lowPassFilter(mapFFT, frequencyMap, cutoff, shape):
 
 	sizeMap = mapFFT.shape;
 
-	#get number of cpus
-	numCores = multiprocessing.cpu_count();
-	
 	#do filtering of the map
 	filterMap = tanh_filter(frequencyMap, cutoff);
 	filteredftMap = filterMap*mapFFT;
 	
-	#do ifft and get real parts
-	#filteredMap = np.fft.irfftn(filteredftMap, shape);
-	#filteredMap = np.real(filteredMap);
-
 	#do iverse FFT
-	fftObject = pyfftw.builders.irfftn(filteredftMap, shape, threads = numCores);
-	filteredMap = fftObject();
+	try: #optional with pyfftw
+		import pyfftw
+		import multiprocessing
+
+		# get number of cpus
+		numCores = multiprocessing.cpu_count();
+
+		fftObject = pyfftw.builders.irfftn(filteredftMap, shape, threads = numCores);
+		filteredMap = fftObject();
+	except:
+		filteredMap = np.fft.irfftn(filteredftMap, shape);
+
 
 	filteredMap = np.real(filteredMap);