Deep CFR imitation pretraining 추가

tests/games/classic/test_deep_cfr_imitation.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+from coolrl_lost_cities.games.classic.game import LostCitiesConfig
+
+from coolrl_lost_cities.games.classic.deep_cfr.imitation import (
+    collect_safe_heuristic_samples,
+    new_pretrained_strategy_network,
+)
+
+
+def test_collect_safe_heuristic_samples_shapes() -> None:
+    x, y, legal = collect_safe_heuristic_samples(LostCitiesConfig(seed=61), games=1, seed=61)
+
+    assert len(x) == len(y) == len(legal)
+    assert x.ndim == 2
+    assert y.shape == legal.shape
+    assert y.sum(axis=1).min() == 1.0
+
+
+def test_pretrain_strategy_network_smoke() -> None:
+    network, metrics = new_pretrained_strategy_network(
+        LostCitiesConfig(seed=67),
+        hidden_size=16,
+        games=1,
+        seed=67,
+        steps=1,
+    )
+
+    assert metrics.samples > 0
+    assert metrics.loss >= 0.0
+    assert network is not None