adding assert that cropping and subsampling cannot be used together

Author: azrael417

makani/utils/driver.py

@@ -172,6 +172,9 @@ def _set_data_shapes(self, params, dataset):
         params.img_shape_y_resampled = dataset.img_shape_y_resampled
         params.subsampling_factor = dataset.subsampling_factor
 
+        if (params.subsampling_factor > 1) and ((params.img_crop_shape_x != params.img_shape_x) or (params.img_crop_shape_y != params.img_shape_y)):
+            raise ValueError("Image cropping and data subsampling cannot be used together. Please set the crop shape to the image shape or set subsampling factor to 1.")
+
         # derived quantities
         params["N_in_predicted_channels"] = params.N_in_channels