remove fopenmp

Author: fangchenli

pandas/_libs/window/aggregations.pyx

@@ -2,8 +2,6 @@
 
 import cython
 
-from cython.parallel cimport prange
-
 from libcpp.deque cimport deque
 
 import numpy as np
@@ -1411,13 +1409,7 @@ def ewma_time(ndarray[float64_t] vals, int minp, ndarray[int64_t] times,
 
                 weights_sum = 0
                 weights_dot = 0
-                if N > 100:
-                    for j in prange(num_not_nan):
-                        weight = 0.5 ** (<float>(time - times_masked[j]) / halflife)
-                        weights_sum += weight
-                        weights_dot += weight * observations[j]
-                else:
-                    for j in range(num_not_nan):
+                for j in range(num_not_nan):
                         weight = 0.5 ** (<float>(time - times_masked[j]) / halflife)
                         weights_sum += weight
                         weights_dot += weight * observations[j]

setup.py

@@ -490,9 +490,6 @@ def run(self):
         if np.__version__ < LooseVersion("1.16.0"):
             extra_compile_args.remove("-Werror")
 
-extra_compile_args.append('-fopenmp')
-extra_link_args.append('-fopenmp')
-
 # ----------------------------------------------------------------------
 # Specification of Dependencies