Merge pull request #84 from Axelrod-Python/random_seed

Random seeding

Author: meatballs

.travis.yml

@@ -1,7 +1,7 @@
 language: python
 python:
-  - 3.5
   - 3.6
+  - 3.7
 dist: xenial
 sudo: required
 services:
@@ -19,5 +19,6 @@ before_install:
 install:
   - pip install -r requirements.txt
   - pip install pytest
+  - python setup.py install
 script:
-    - pytest
+    - pytest tests/

requirements.txt

@@ -1 +1 @@
-axelrod>=4.8.0
+axelrod>=4.10.0

src/axelrod_fortran/player.py

@@ -1,5 +1,4 @@
 from ctypes import byref, c_float, c_int, POINTER
-import random
 import warnings
 
 import axelrod as axl
@@ -42,16 +41,19 @@ def __init__(self, original_name):
             A instance of an axelrod Game
         """
         super().__init__()
+        # The order of the next 4 lines is important. We must first check that
+        # the player name is valid, then grab a copy of the shared library,
+        # and then setup the actual strategy function.
+        self.original_name = original_name
         self.index, self.shared_library_filename = \
-            shared_library_manager.get_filename_for_player(original_name)
+            shared_library_manager.get_filename_for_player(self.original_name)
         self.shared_library = load_library(self.shared_library_filename)
-        self.original_name = original_name
         self.original_function = self.original_name
+
         is_stochastic = characteristics[self.original_name]['stochastic']
         if is_stochastic is not None:
             self.classifier['stochastic'] = is_stochastic
 
-
     def __enter__(self):
         return self
 
@@ -63,11 +65,11 @@ def original_name(self):
         return self.__original_name
 
     @original_name.setter
-    def original_name(self, value):
-        if value in characteristics:
-            self.__original_name = value
+    def original_name(self, key):
+        if key in characteristics:
+            self.__original_name = key
         else:
-            raise ValueError('{} is not a valid Fortran function'.format(value))
+            raise ValueError('{} is not a valid Fortran function'.format(key))
 
     @property
     def original_function(self):
@@ -105,7 +107,7 @@ def strategy(self, opponent):
             my_last_move = original_actions[self.history[-1]]
         move_number = len(self.history) + 1
         if self.classifier["stochastic"]:
-            random_value = random.random()
+            random_value = self._random.random()
         else:
             random_value = 0
         original_action = self.original_strategy(
@@ -119,7 +121,16 @@ def _release_shared_library(self):
         # thread closes before the player class is garbage collected, which
         # tends to happen at the end of a script.
         try:
-            shared_library_manager.release(self.original_name, self.index)
+            name = self.original_name
+            index = self.index
+        except AttributeError:
+            # If the Player does finish __init__, because the name of a
+            # non-existent strategy is supplied, a copy of the shared library
+            # won't be loaded, nor will self.original_name or self.index
+            # exist. In that case there's nothing to do.
+            return
+        try:
+            shared_library_manager.release(name, index)
         except FileNotFoundError:
             pass
 

src/axelrod_fortran/shared_library_manager.py

@@ -59,7 +59,7 @@ def create_library_copy(self):
         # Copy the library file to a new (temp) location.
         temp_directory = tempfile.gettempdir()
         copy_number = len(self.filenames)
-        filename =  "{}-{}-{}".format(
+        filename = "{}-{}-{}".format(
             self.prefix,
             str(copy_number),
             self.shared_library_name)

src/axelrod_fortran/strategies.py

@@ -348,7 +348,7 @@
         'original_rank': None},
 }
 
-all_strategies = characteristics.keys()
+all_strategies = list(characteristics.keys())
 
 # Players from Axelrod's second tournament.
 second_tournament_strategies = [

tests/test_player.py

@@ -1,11 +1,11 @@
-from ctypes import c_int, c_float, POINTER, CDLL
+from ctypes import c_int, c_float, POINTER
 import itertools
 
 import pytest
 
 from axelrod_fortran import Player, characteristics, all_strategies
 from axelrod import (Alternator, Cooperator, Defector, Match, MoranProcess,
-                     Game, basic_strategies, seed)
+                     Game, RandomGenerator, Tournament, basic_strategies)
 from axelrod.action import Action
 
 
@@ -122,32 +122,33 @@ def test_implemented_strategies():
     """
     for strategy, dictionary in characteristics.items():
         axelrod_class = dictionary["axelrod-python_class"]
-        player = Player(strategy)
-        if (axelrod_class is not None and
-            player.classifier["stochastic"] is False):
-            axl_player = axelrod_class()
+        stochastic = Player(strategy).classifier["stochastic"]
+        if axelrod_class is not None and not stochastic:
             for opponent_strategy in basic_strategies:
+                player = Player(strategy)
                 opponent = opponent_strategy()
                 match = Match((player, opponent))
                 interactions = match.play()
+
+                axl_player = axelrod_class()
+                opponent = opponent_strategy()
                 axl_match = Match((axl_player, opponent))
-                assert interactions == axl_match.play(), (player, opponent)
+                axl_interactions = axl_match.play()
+                assert interactions == axl_interactions
 
 
 def test_champion_v_alternator():
     """
-    Specific regression test for a bug.
+    Specific regression test for a bug. See:
+    https://github.com/Axelrod-Python/axelrod-fortran/issues/62
     """
     player = Player("k61r")
     opponent = Alternator()
-
-    match = Match((player, opponent))
-
-    seed(0)
+    seed = 3
+    match = Match((player, opponent), seed=seed)
     interactions = match.play()
     assert interactions[25:30] == [(C, D), (C, C), (C, D), (D, C), (C, D)]
-
-    seed(0)
+    match = Match((player, opponent), seed=seed)
     assert interactions == match.play()
 
 
@@ -157,9 +158,7 @@ def test_warning_for_self_interaction(recwarn):
     """
     player = Player("k42r")
     opponent = player
-
     match = Match((player, opponent))
-
     interactions = match.play()
     assert len(recwarn) == 1
 
@@ -168,13 +167,10 @@ def test_no_warning_for_normal_interaction(recwarn):
     """
     Test that a warning is not given for a normal interaction
     """
-    player = Player("k42r")
-    opponent = Alternator()
     for players in [(Player("k42r"), Alternator()),
                     (Player("k42r"), Player("k41r"))]:
 
         match = Match(players)
-
         interactions = match.play()
         assert len(recwarn) == 0
 
@@ -185,3 +181,35 @@ def test_multiple_copies(recwarn):
     mp = MoranProcess(players)
     mp.play()
     mp.populations_plot()
+
+
+def test_match_reproducibility():
+    for _ in range(100):
+        rng = RandomGenerator()
+        seed = rng.random_seed_int()
+        strategies = rng.choice(all_strategies, size=2)
+        players1 = [Player(strategy) for strategy in strategies]
+        match1 = Match(players1, turns=200, noise=0.1, seed=seed)
+        results1 = match1.play()
+
+        players2 = [Player(strategy) for strategy in strategies]
+        match2 = Match(players2, turns=200, noise=0.1, seed=seed)
+        results2 = match2.play()
+
+        assert (results1 == results2)
+
+
+def test_tournament_reproducibility():
+    rng = RandomGenerator()
+    seed = rng.random_seed_int()
+    strategies = rng.choice(all_strategies, size=10)
+    players1 = [Player(strategy) for strategy in strategies]
+    tournament1 = Tournament(players1, seed=seed, repetitions=2)
+    results1 = tournament1.play(processes=2)
+
+    players2 = [Player(strategy) for strategy in strategies]
+    tournament2 = Tournament(players2, seed=seed, repetitions=2)
+    results2 = tournament2.play(processes=2)
+
+    assert (results1.ranked_names == results2.ranked_names)
+