I am simulating a very lame game that basically counts the amount of coins and enemies a player collects as she progresses in the game. The code contains two jitclasses: a player jitclass and a game jitclass.
For the player class we have some attributes and some methods that describe the progression of the player along the game.
from numba import jitclass, int64, float64, deferred_type
from numba.typed import List
import random
specs_player = OrderedDict()
specs_player['level'] = int64
specs_player['coins'] = float64
@jitclass(specs_player)
class Player:
def __init__(self):
self.level = 0
self.coins = 0
self.enemies = List()
def pass_level(self):
self.level += 1
def collect_coins(self, c):
self.coins += c
def collect_enemies(self, e):
self.enemies.append(e)
def reset_player(self):
self.level = 0
self.coins = 0
self.enemies = List()
As you can see, the attribute enemies is a list that gets the values appended as the player progresses in the game.
The game jitclass calls the player jitclass as an attribute using the first two lines:
Player_type = deferred_type()
Player_type.define(Player.class_type.instance_type)
specs_Game = OrderedDict()
specs_Game['last_level'] = int64
specs_Game['diff_threshold'] = float64
specs_Game['player'] = Player_type
class Game:
def __init__(self, l, t):
self.player = Player()
self.last_level = l
self.diff_threshold = t
def play_gameround(self):
random_draw = random.uniform(0, 1)
if random_draw > self.diff_threshold:
# Pass Level
self.player.pass_level()
# Collect coins
coins_earned = 100*(random_draw - self.diff_threshold)
self.player.collect_coins(coins_earned)
#Collect enemies
if coins_earned > 10:
self.player.collect_enemies()
def reset_gameplay(self):
self.player.reset_player()
def continue_playing(self):
condition = self.player.level < self.last_level
return(condition)
Finally, a function called run_one_player simulates the progression of one player and returns an array with all the necessary data:
def run_one_player(gameplay):
while gameplay.continue_playing():
gameplay.play_gameround()
player_data = np.array([gameplay.player.level,
gameplay.player.coins,
gameplay.player.enemies])
return (player_data)
To run the code I just type:
g = Game(l = 10, t = 0.5)
data_list = run_one_player(g)
This, however, does not work and Numba returns the following error, that I am pretty sure it comes from the fact that I am not correctly defining the Numba type for the enemies field.
---------------------------------------------------------------------------
TypingError Traceback (most recent call last)
<ipython-input-51-f6340d9cfcd7> in <module>
1 players = 10
----> 2 g = Game(l = 10, t = 0.5)
3
4 data_list = run_one_player(g)
<ipython-input-49-6e42f0104cf1> in __init__(self, l, t)
46
47 def __init__(self, l, t):
---> 48 self.player = Player()
49 self.last_level = l
50 self.diff_threshold = t
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/jitclass/base.py in __call__(cls, *args, **kwargs)
124 bind = cls._ctor_sig.bind(None, *args, **kwargs)
125 bind.apply_defaults()
--> 126 return cls._ctor(*bind.args[1:], **bind.kwargs)
127
128
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/dispatcher.py in _compile_for_args(self, *args, **kws)
374 e.patch_message(msg)
375
--> 376 error_rewrite(e, 'typing')
377 except errors.UnsupportedError as e:
378 # Something unsupported is present in the user code, add help info
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/dispatcher.py in error_rewrite(e, issue_type)
341 raise e
342 else:
--> 343 reraise(type(e), e, None)
344
345 argtypes = []
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/six.py in reraise(tp, value, tb)
656 value = tp()
657 if value.__traceback__ is not tb:
--> 658 raise value.with_traceback(tb)
659 raise value
660
TypingError: Failed in nopython mode pipeline (step: nopython frontend)
Failed in nopython mode pipeline (step: nopython frontend)
Cannot resolve setattr: (instance.jitclass.Player#123b442d0<level:int64,coins:float64>).enemies = ListType[undefined]
File "<ipython-input-49-6e42f0104cf1>", line 18:
def __init__(self):
<source elided>
self.coins = 0
self.enemies = List()
^
[1] During: typing of set attribute 'enemies' at <ipython-input-49-6e42f0104cf1> (18)
File "<ipython-input-49-6e42f0104cf1>", line 18:
def __init__(self):
<source elided>
self.coins = 0
self.enemies = List()
^
[1] During: resolving callee type: jitclass.Player#123b442d0<level:int64,coins:float64>
[2] During: typing of call at <string> (3)
[3] During: resolving callee type: jitclass.Player#123b442d0<level:int64,coins:float64>
[4] During: typing of call at <string> (3)
File "<string>", line 3:
<source missing, REPL/exec in use?>
This is not usually a problem with Numba itself but instead often caused by
the use of unsupported features or an issue in resolving types.
To see Python/NumPy features supported by the latest release of Numba visit:
http://numba.pydata.org/numba-doc/latest/reference/pysupported.html
and
http://numba.pydata.org/numba-doc/latest/reference/numpysupported.html
For more information about typing errors and how to debug them visit:
http://numba.pydata.org/numba-doc/latest/user/troubleshoot.html#my-code-doesn-t-compile
If you think your code should work with Numba, please report the error message
and traceback, along with a minimal reproducer at:
https://github.com/numba/numba/issues/new