Allow pycbc inspiral to run with only numpy fft

bin/pycbc_inspiral

@@ -301,19 +301,21 @@ def template_triggers(t_num):
     return out_vals_all, tparam
 
 with ctx:
-    # The following FFTW specific options needed to wait until
-    # we were inside the scheme context.
+    if opt.fft_backends == 'fftw':
 
-    # Import system wisdom.
-    if opt.fftw_import_system_wisdom:
-        fft.fftw.import_sys_wisdom()
+        # The following FFTW specific options needed to wait until
+        # we were inside the scheme context.
 
-    # Read specified user-provided wisdom files
-    if opt.fftw_input_float_wisdom_file is not None:
-        fft.fftw.import_single_wisdom_from_filename(opt.fftw_input_float_wisdom_file)
+        # Import system wisdom.
+        if opt.fftw_import_system_wisdom:
+            fft.fftw.import_sys_wisdom()
 
-    if opt.fftw_input_double_wisdom_file is not None:
-        fft.fftw.import_double_wisdom_from_filename(opt.fftw_input_double_wisdom_file)
+        # Read specified user-provided wisdom files
+        if opt.fftw_input_float_wisdom_file is not None:
+            fft.fftw.import_single_wisdom_from_filename(opt.fftw_input_float_wisdom_file)
+
+        if opt.fftw_input_double_wisdom_file is not None:
+            fft.fftw.import_double_wisdom_from_filename(opt.fftw_input_double_wisdom_file)
 
     flow = opt.low_frequency_cutoff
     flen = strain_segments.freq_len
@@ -499,10 +501,11 @@ event_mgr.save_performance(ncores, len(segments), len(bank), run_time, tsetup)
 logging.info("Writing out triggers")
 event_mgr.write_events(opt.output)
 
-if opt.fftw_output_float_wisdom_file:
-    fft.fftw.export_single_wisdom_to_filename(opt.fftw_output_float_wisdom_file)
+if opt.fft_backends == 'fftw':
+    if opt.fftw_output_float_wisdom_file:
+        fft.fftw.export_single_wisdom_to_filename(opt.fftw_output_float_wisdom_file)
 
-if opt.fftw_output_double_wisdom_file:
-    fft.fftw.export_double_wisdom_to_filename(opt.fftw_output_double_wisdom_file)
+    if opt.fftw_output_double_wisdom_file:
+        fft.fftw.export_double_wisdom_to_filename(opt.fftw_output_double_wisdom_file)
 
 logging.info("Finished")

pycbc/fft/npfft.py

@@ -94,3 +94,12 @@ def __init__(self, invec, outvec, nbatch=1, size=None):
 
     def execute(self):
         ifft(self.invec, self.outvec, self.prec, self.itype, self.otype)
+
+def insert_fft_options(optgroup):
+    """
+    Inserts the options that affect the behavior of this backend
+
+    This backend has no options
+    """
+    return
+