set BIG_FLOAT to BEST_FLOAT

Author: Ben Cipollini

nibabel/tests/test_round_trip.py

@@ -45,8 +45,9 @@ def check_params(in_arr, in_type, out_type):
     return arr, arr_dash, slope, inter
 
 
-BFT = best_float()
-LOGe2 = np.log(BFT(2))
+BEST_FLOAT = best_float()
+LOGe2 = np.log(BEST_FLOAT(2))
+BIG_FLOAT = BEST_FLOAT
 
 
 def big_bad_ulp(arr):
@@ -70,7 +71,7 @@ def big_bad_ulp(arr):
     # Assumes array is floating point
     arr = np.asarray(arr)
     info = type_info(arr.dtype)
-    working_arr = np.abs(arr.astype(BFT))
+    working_arr = np.abs(arr.astype(BEST_FLOAT))
     # Log2 for numpy < 1.3
     fl2 = np.zeros_like(working_arr) + info['minexp']
     # Avoid divide by zero error for log of 0
@@ -92,9 +93,6 @@ def test_big_bad_ulp():
         assert_array_equal(big_bad_ulp(in_arr).astype(ftype), out_arr)
 
 
-BIG_FLOAT = np.float64
-
-
 def test_round_trip():
     scaling_type = np.float32
     rng = np.random.RandomState(20111121)