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"""Keras neural network."""
import sys
import os
import os.path
import numpy
from matplotlib import pyplot
from tensorflow.keras.models import load_model
from tensorflow.keras.utils import plot_model
from imago.data.enums import Player
class NeuralNetwork:
DEF_BOARD_SIZE = 9
NETWORK_ID = "neuralNetwork"
DEFAULT_MODEL_FILE = "models/imagoKerasModel.h5"
def __init__(self, modelPath="", boardSize=DEF_BOARD_SIZE):
self.boardSize = boardSize
self.path = self.DEFAULT_MODEL_FILE
if modelPath != "":
self.path = modelPath
try:
self.model = self._loadModel(self.path)
except FileNotFoundError:
self.model = self._initModel(boardSize)
self.saveModelPlot()
def _initModel(self, boardSize=DEF_BOARD_SIZE):
raise NotImplementedError("Tried to directly use NeuralNetwork class. Use one of the subclasses instead.")
def trainModel(self, games):
trainMoves = []
targets = []
for game in games:
for move in self._movesToTrainMoves(game):
trainMoves.append(move)
for target in self._movesToTargets(game):
targets.append(target)
trainMoves = numpy.array(trainMoves)
targets = numpy.array(targets)
self.model.fit(
x=trainMoves,
y=targets,
validation_split=0.1,
batch_size=1,
epochs=20,
shuffle=False,
verbose=2
)
def _loadModel(self, modelPath):
# Load model
if os.path.isfile(modelPath):
return load_model(modelPath)
else:
raise FileNotFoundError("Keras neural network model file not found at %s"
% modelPath)
def saveModel(self, modelPath=""):
"""Saves the neural network model at the given path."""
if modelPath != "":
self.model.save(modelPath)
else:
self.model.save(self.path)
def _movesToTrainMoves(self, moves):
trainMoves = []
for move in moves:
if len(move.nextMoves) == 0:
continue
player = move.nextMoves[0].getPlayer()
board = move.board.board
trainMove = self._boardToPlayerContext(board, player)
trainMoves.append(trainMove)
return trainMoves
def _boardToPlayerContext(self, board, player):
"""Converts the board to a 3D matrix with two representations of the board, one
marking the player's stones and the oter marking the opponent's stones."""
boardRows = len(board)
boardCols = len(board[0])
contextBoard = numpy.zeros((boardRows, boardCols, 2), dtype = float)
for row in range(boardRows):
for col in range(boardCols):
if board[row][col] != Player.EMPTY:
if board[row][col] == player:
contextBoard[row][col][0] = 1
else:
contextBoard[row][col][1] = 1
return contextBoard
def _movesToTargets(self, moves):
"""Converts the moves to 2D matrices with values zero except for a one on the
played vertex."""
targets = []
for move in moves:
if len(move.nextMoves) == 0:
continue
target = numpy.zeros(self.boardSize * self.boardSize, dtype = float)
target[move.nextMoves[0].getRow() * self.boardSize + move.nextMoves[0].getCol()] = 1
targets.append(target.tolist())
return targets
def pickMove(self, gameMove, player):
"""Uses the model's predict function to pick the highest valued vertex to play."""
predictionVector = self._predict(gameMove, player)[0]
prediction = numpy.zeros((self.boardSize, self.boardSize))
for row in range(self.boardSize):
for col in range(self.boardSize):
prediction[row][col] = predictionVector[row * self.boardSize + col]
self.saveHeatmap(prediction)
# Search the highest valued vertex which is also playable
playableVertices = gameMove.getPlayableVertices()
highest = -sys.float_info.max
hRow = -1
hCol = -1
for row in range(self.boardSize):
for col in range(self.boardSize):
if prediction[row][col] > highest and (row, col) in playableVertices:
hRow = row
hCol = col
highest = prediction[row][col]
return [hRow, hCol]
def _predict(self, gameMove, player):
board = gameMove.board.board
sampleBoards = self._boardToPlayerContext(board, player)
sampleBoards = numpy.array([sampleBoards])
return self.model.predict(
x = sampleBoards,
batch_size = 1,
verbose = 2)
def saveHeatmap(self, data):
rows = len(data)
cols = len(data[0])
fig, ax = pyplot.subplots()
im = ax.imshow(data, cmap="YlGn")
# Show all ticks and label them with the respective list entries
ax.set_xticks(numpy.arange(cols))
ax.set_xticklabels(self._getLetterLabels(cols))
ax.set_yticks(numpy.arange(rows))
ax.set_yticklabels(numpy.arange(rows, 0, -1))
# Loop over data dimensions and create text annotations.
textColorThreshold = 0.35
for row in range(rows):
for col in range(cols):
textColor = ("k" if data[row, col] < textColorThreshold else "w")
ax.text(col, row, "%.2f"%(data[row, col]),
ha="center", va="center", color=textColor)
ax.set_title("Heat map of move likelihood")
fig.tight_layout()
pyplot.savefig("heatmaps/heatmap_%s_%s_%d.png" %
(
self.NETWORK_ID,
self.path.replace('/','-'),
len([file for file in os.listdir("heatmaps")])
)
)
def _getLetterLabels(self, count):
labels = []
letter = 'A'
for _ in range(count):
labels.append(letter)
letter = chr(ord(letter) + 1)
# Skip I
if letter == 'I':
letter = 'J'
return labels
def saveModelPlot(self):
plot_model(
self.model,
to_file="model.png",
show_shapes=True,
show_dtype=True,
show_layer_names=True,
rankdir="TB",
expand_nested=True,
dpi=96,
layer_range=None,
show_layer_activations=True,
)
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