Extend H3 spatial fallback ladder

dumas_h3_latent_upscale.py

@@ -506,8 +506,8 @@ def _shrink_model_tile_param(param):
     next_param = dict(param)
     mode = str(next_param.get("tile_size_mode") or "specific_size")
     if mode == "rows_cols":
-        rows = min(16, max(1, int(next_param.get("grid_rows", 2) or 2) * 2))
-        cols = min(16, max(1, int(next_param.get("grid_cols", 2) or 2) * 2))
+        rows = min(32, max(1, int(next_param.get("grid_rows", 2) or 2) * 2))
+        cols = min(32, max(1, int(next_param.get("grid_cols", 2) or 2) * 2))
         if rows == int(next_param.get("grid_rows", 2) or 2) and cols == int(next_param.get("grid_cols", 2) or 2):
             return None
         next_param["grid_rows"] = rows
@@ -527,7 +527,7 @@ def _shrink_model_tile_param(param):
     # Jump straight from a coarse specific-size tile to a conservative 4x4
     # equal-grid split. That usually cuts peak VRAM much harder than halving
     # the tile size through several retries, and it keeps the later retry
-    # ladder simple: 4x4 -> 8x8 -> 16x16.
+    # ladder simple: 4x4 -> 8x8 -> 16x16 -> 32x32.
     next_param["tile_size_mode"] = "rows_cols"
     next_param["grid_rows"] = 4
     next_param["grid_cols"] = 4

tests/test_dumas_h3_longvideos.py

@@ -1202,6 +1202,22 @@ class DumasH3LongVideosHelperTests(unittest.TestCase):
         self.assertEqual(smaller["fade_height"], 0)
         self.assertEqual(smaller["min_tile_size"], 32)
 
+    def test_shrink_model_tile_param_rows_cols_can_reach_thirty_two(self):
+        latent = importlib.import_module("dumas_h3_latent_upscale")
+        smaller = latent._shrink_model_tile_param({
+            "tile_size_mode": "rows_cols",
+            "grid_rows": 16,
+            "grid_cols": 16,
+            "spatial_w_overlap": 0,
+            "spatial_h_overlap": 0,
+            "fade_width": 0,
+            "fade_height": 0,
+            "min_tile_size": 32,
+        })
+        self.assertIsNotNone(smaller)
+        self.assertEqual(smaller["grid_rows"], 32)
+        self.assertEqual(smaller["grid_cols"], 32)
+
     def test_temporal_segments_split_long_sequences(self):
         latent = importlib.import_module("dumas_h3_latent_upscale")
         bounds = latent._temporal_segments(36, 85, 17)