Changes following PR review

Author: marcharper

axelrod/moran.py

@@ -110,8 +110,11 @@ def __init__(
             given
         fitness_transformation:
             A function mapping a score to a (non-negative) float
+        mutation_method:
+            A string indicating if the mutation method should be between original types ("transition")
+            or based on the player's mutation method, if present ("atomic").
         stop_on_fixation:
-            A bool indicating if the process should stop on fixation.
+            A bool indicating if the process should stop on fixation
         """
         self.turns = turns
         self.prob_end = prob_end

axelrod/random_.py

@@ -73,14 +73,8 @@ def randrange(a: int, b: int) -> int:
 
 def random_vector(size):
     """Create a random vector of values in [0, 1] that sums to 1."""
-    vector = []
-    s = 1
-    for _ in range(size - 1):
-        r = s * random.random()
-        vector.append(r)
-        s -= r
-    vector.append(s)
-    return vector
+    vector = np.random.random(size)
+    return vector / np.sum(vector)
 
 
 class Pdf(object):

axelrod/tests/strategies/test_hmm.py

@@ -232,7 +232,7 @@ def test_vector_to_instance(self):
         num_states = 4
         vector = []
         for _ in range(2 * num_states):
-            vector += random_vector(num_states)
+            vector.extend(list(random_vector(num_states)))
         for _ in range(num_states + 1):
             vector.append(random.random())
         player = self.player_class(num_states=num_states)