Fix stale batch state when looping set_image with generate_masks_by_points_patch (#495)

Reset images_batch, sources_batch, batch_state, and batch_results to None
in set_image() so that generate_masks_by_points_patch() properly
re-initializes batch state for the new image. Previously, calling
set_image() in a loop left stale batch attributes from the prior
iteration, causing dimension mismatch errors.

Closes #494

Author: giswqs

samgeo/samgeo3.py

@@ -346,6 +346,14 @@ def set_image(
 
         self.image_height, self.image_width = self.image.shape[:2]
 
+        # Reset batch processing attributes so that subsequent calls to
+        # generate_masks_by_points_patch() re-initialize the batch state
+        # for the new image instead of reusing stale state from a previous image.
+        self.images_batch = None
+        self.sources_batch = None
+        self.batch_state = None
+        self.batch_results = None
+
         # Convert to PIL Image for processing
         image_for_processor = Image.fromarray(self.image)