Merge branch 'sincos' of gitlab.mpcdf.mpg.de:mtr/pypocketfft into sincos

test.py

@@ -204,6 +204,9 @@ def testdcst1D(len, inorm, type, dtype):
     a = (np.random.rand(len)-0.5).astype(dtype)
     eps = tol[dtype]
     itp = (0, 1, 3, 2, 4)
+    if type==4 and len%2 == 1:  # relaxed accuracies for odd-length type 4 transforms
+        special_tol = {np.float32: 4e-5, np.float64: 6e-14, np.longfloat: 4e-17}
+        eps = special_tol[dtype]
     itype = itp[type]
     if type != 1 or len > 1:  # there are no length-1 type 1 DCTs
         _assert_close(a, pypocketfft.dct(pypocketfft.dct(a, inorm=inorm, type=type), inorm=2-inorm, type=itype), eps)