Added best-action plot

celeste/celeste_ai/plotting/__init__.py

@@ -1,2 +1,4 @@
 from .plot_actual_reward import actual_reward
 from .plot_predicted_reward import predicted_reward
+from .plot_best_action import best_action
+

celeste/celeste_ai/plotting/plot_best_action.py

@@ -0,0 +1,105 @@
+import torch
+import numpy as np
+from pathlib import Path
+import matplotlib.pyplot as plt
+
+# All of the following are required to load
+# a pickled model.
+from celeste_ai.celeste import Celeste
+from celeste_ai.network import DQN
+from celeste_ai.network import Transition
+
+
+def best_action(
+	model_file: Path,
+	out_filename: Path,
+	*,
+	device = torch.device("cpu")
+):
+	if not model_file.is_file():
+		raise Exception(f"Bad model file {model_file}")
+	out_filename.parent.mkdir(exist_ok = True, parents = True)
+
+	# Create and load model
+	policy_net = DQN(
+		len(Celeste.state_number_map),
+		len(Celeste.action_space)
+	).to(device)
+	checkpoint = torch.load(
+		model_file,
+		map_location = device
+	)
+	policy_net.load_state_dict(checkpoint["policy_state_dict"])
+
+
+
+	# Compute preditions
+	p = np.zeros((128, 128, 2), dtype=np.float32)
+	with torch.no_grad():
+		for r in range(len(p)):
+			for c in range(len(p[r])):
+				x = c / 128.0
+				y = r / 128.0
+
+				k = np.asarray(policy_net(
+					torch.tensor(
+						[x, y, 0],
+						dtype = torch.float32,
+						device = device
+					).unsqueeze(0)
+				)[0])
+				p[r][c][0] = np.argmax(k)
+
+				k = np.asarray(policy_net(
+					torch.tensor(
+						[x, y, 1],
+						dtype = torch.float32,
+						device = device
+					).unsqueeze(0)
+				)[0])
+				p[r][c][1] = np.argmax(k)
+
+
+	# Plot predictions
+	fig, axs = plt.subplots(1, 2, figsize = (10, 10))
+	ax = axs[0]
+	ax.set(
+		adjustable = "box",
+		aspect = "equal",
+		title = "Best Action"
+	)
+
+	plot = ax.pcolor(
+		p[:,:,0],
+		cmap = "Set1",
+		vmin = 0,
+		vmax = 8
+	)
+	ax.invert_yaxis()
+	fig.colorbar(plot)
+
+	ax = axs[1]
+	ax.set(
+		adjustable = "box",
+		aspect = "equal",
+		title = "Best Action"
+	)
+
+	plot = ax.pcolor(
+		p[:,:,0],
+		cmap = "Set1",
+		vmin = 0,
+		vmax = 8
+	)
+
+	ax.invert_yaxis()
+	fig.colorbar(plot)
+
+	fig.savefig(out_filename)
+	plt.close()
+
+
+
+
+
+