Revert "Fix some np.array calls"

This reverts commit e34b656.

Author: leandrolcampos

tensorflow_probability/python/math/special_test.py

@@ -200,7 +200,10 @@ def testBetaincGradient(self, dtype):
     space = np.logspace(-2., 2., 10).tolist()
     space_x = np.linspace(0.01, 0.99, 10).tolist()
     a, b, x = zip(*list(itertools.product(space, space, space_x)))
-    a, b, x = [np.array(z, dtype=dtype) for z in [a, b, x]]
+
+    a = np.array(a, dtype=dtype)
+    b = np.array(b, dtype=dtype)
+    x = np.array(x, dtype=dtype)
 
     # Wrap in tf.function and compile for faster computations.
     betainc = tf.function(tfp_math.betainc, autograph=False, jit_compile=True)
@@ -229,7 +232,10 @@ def testBetaincDerivativeFinite(self, dtype):
     space = np.logspace(np.log10(eps), 5.).tolist()
     space_x = np.linspace(eps, 1. - eps).tolist()
     a, b, x = zip(*list(itertools.product(space, space, space_x)))
-    a, b, x = [np.array(z, dtype=dtype) for z in [a, b, x]]
+
+    a = np.array(a, dtype=dtype)
+    b = np.array(b, dtype=dtype)
+    x = np.array(x, dtype=dtype)
 
     def betainc_partials(a, b, x):
       return tfp_math.value_and_gradient(tfp_math.betainc, [a, b, x])[1]
@@ -433,7 +439,10 @@ def testBetaincSecondDerivativeFinite(self, dtype):
     space = np.logspace(-2., 2., 5).tolist()
     space_x = np.linspace(0.01, 0.99, 5).tolist()
     a, b, x = zip(*list(itertools.product(space, space, space_x)))
-    a, b, x = [np.array(z, dtype=dtype) for z in [a, b, x]]
+
+    a = np.array(a, dtype=dtype)
+    b = np.array(b, dtype=dtype)
+    x = np.array(x, dtype=dtype)
 
     def betainc_partials(a, b, x):
       return tfp_math.value_and_gradient(tfp_math.betainc, [a, b, x])[1]