fix black formating

Author: NimaSarajpoor

sdp/challenger_sdp.py

@@ -11,4 +11,4 @@ def sliding_dot_product(Q, T):
     out = np.empty(l)
     for i in range(l):
         out[i] = np.dot(Q, T[i : i + m])
-    return out
+    return out

sdp/pyfftw_sdp.py

@@ -58,8 +58,8 @@ def __call__(self, Q, T):
 
         # RFFT(T) * RFFT(Q)
         np.multiply(self.complex_arr, complex_arr_T, out=self.complex_arr)
-        
-        # IRFFT 
+
+        # IRFFT
         # input is in self.complex_arr
         # output is in self.real_arr
         self.irfft_obj.execute()