Use spawn instead of fork for new process

Author: moderouin

axelrod/data/all_classifiers.yml

@@ -1,12 +1,12 @@
-$\phi$:
+$\\phi$:
   inspects_source: false
   long_run_time: false
   makes_use_of: !!set {}
   manipulates_source: false
   manipulates_state: false
   memory_depth: .inf
   stochastic: false
-$\pi$:
+$\\pi$:
   inspects_source: false
   long_run_time: false
   makes_use_of: !!set {}
@@ -439,6 +439,14 @@ Evolved ANN 5 Noise 05:
   manipulates_state: false
   memory_depth: .inf
   stochastic: false
+EvolvedAttention:
+  inspects_source: false
+  long_run_time: false
+  makes_use_of: !!set {}
+  manipulates_source: false
+  manipulates_state: false
+  memory_depth: 200
+  stochastic: false
 Evolved FSM 16:
   inspects_source: false
   long_run_time: false

axelrod/strategies/axelrod_second.py

@@ -441,16 +441,16 @@ class SecondByGrofman(Player):
     1. First it cooperates on the first two rounds
     2. For rounds 3-7 inclusive, it plays the same as the opponent's last move
     3. Thereafter, it applies the following logic, looking at its memory of the
-       last 8\* rounds (ignoring the most recent round).
+       last 8\\* rounds (ignoring the most recent round).
 
       - If its own previous move was C and the opponent has defected less than
-        3 times in the last 8\* rounds, cooperate
+        3 times in the last 8\\* rounds, cooperate
       - If its own previous move was C and the opponent has defected 3 or
-        more times in the last 8\* rounds, defect
+        more times in the last 8\\* rounds, defect
       - If its own previous move was D and the opponent has defected only once
-        or not at all in the last 8\* rounds, cooperate
+        or not at all in the last 8\\* rounds, cooperate
       - If its own previous move was D and the opponent has defected more than
-        once in the last 8\* rounds, defect
+        once in the last 8\\* rounds, defect
 
     The code looks at the first 7 of the last 8 rounds, ignoring the most
     recent round.

axelrod/strategies/mathematicalconstants.py

@@ -49,7 +49,7 @@ class Golden(CotoDeRatio):
     - Golden: Original Name by Timothy Standen
     """
 
-    name = "$\phi$"
+    name = "$\\phi$"
     ratio = (1 + math.sqrt(5)) / 2
 
 
@@ -62,7 +62,7 @@ class Pi(CotoDeRatio):
     - Pi: Original Name by Timothy Standen
     """
 
-    name = "$\pi$"
+    name = "$\\pi$"
     ratio = math.pi
 
 

axelrod/strategies/zero_determinant.py

@@ -12,7 +12,7 @@ class LRPlayer(MemoryOnePlayer):
 
     The parameter :math:`s` is called the slope and the parameter :math:`l` the
     baseline payoff. For extortionate strategies, the extortion factor
-    :math:`\chi` is the inverse of the slope :math:`s`.
+    :math:`\\chi` is the inverse of the slope :math:`s`.
 
     For the standard prisoner's dilemma where :math:`T > R > P > S` and
     :math:`R > (T + S) / 2 > P`, a pair :math:`(l, s)` is enforceable iff

axelrod/tests/strategies/test_mathematicalconstants.py

@@ -9,7 +9,7 @@
 
 class TestGolden(TestPlayer):
 
-    name = "$\phi$"
+    name = "$\\phi$"
     player = axl.Golden
     expected_classifier = {
         "memory_depth": float("inf"),  # Long memory
@@ -34,7 +34,7 @@ def test_strategy(self):
 
 class TestPi(TestPlayer):
 
-    name = "$\pi$"
+    name = "$\\pi$"
     player = axl.Pi
     expected_classifier = {
         "memory_depth": float("inf"),  # Long memory

axelrod/tournament.py

@@ -3,7 +3,9 @@
 import os
 import warnings
 from collections import defaultdict
-from multiprocessing import Process, Queue, cpu_count
+from multiprocessing import Process, Queue, cpu_count, set_start_method
+
+set_start_method("spawn", force=True)
 from tempfile import mkstemp
 from typing import List, Optional, Tuple
 

docs/how-to/contributing/strategy/writing_the_new_strategy.rst

@@ -83,10 +83,10 @@ strategy::
     name = 'Tit For Tat'
 
 Note that this is mainly used in plots by :code:`matplotlib` so you can use
-LaTeX if you want to.  For example there is strategy with :math:`\pi` as a
+LaTeX if you want to.  For example there is strategy with :math:`\\pi` as a
 name::
 
-    name = '$\pi$'
+    name = '$\\pi$'
 
 Following that you can add in the :code:`classifier` dictionary::
 

tox.ini

@@ -33,8 +33,9 @@ deps =
     mypy
     types-setuptools
 commands =
-    python -m pytest -vvvvv --cov-report term-missing --cov=axelrod --cov-fail-under=100 . --doctest-glob="*.md" --doctest-glob="*.rst"
+    python -m pytest --cov-report term-missing --cov=axelrod --cov-fail-under=100 . -n auto --doctest-glob="*.md" --doctest-glob="*.rst"
     python -m black -l 80 . --check
     python -m isort --check-only axelrod/.
     python run_mypy.py
     python run_strategy_indexer.py
+