Update predict.md (#1125)

Author: gguzzy

docs/predict.md

@@ -69,3 +69,31 @@ result = predict(
 )
 
 ```
+
+- Exclude custom classes on inference:
+
+```python
+from sahi.predict import get_sliced_prediction
+from sahi import AutoDetectionModel
+
+# init a model
+detection_model = AutoDetectionModel.from_pretrained(...)
+
+# define the class names to exclude from custom model inference
+exclude_classes_by_name = ["car"]
+
+# or exclude classes by its custom id
+exclude_classes_by_id = [0]
+
+result = get_sliced_prediction(
+    image,
+    detection_model,
+    slice_height = 256,
+    slice_width = 256,
+    overlap_height_ratio = 0.2,
+    overlap_width_ratio = 0.2,
+    exclude_classes_by_name = exclude_classes_by_name
+    # exclude_classes_by_id = exclude_classes_by_id
+)
+
+```