From b6b0c653f5bb9d99981d54c3f83c3edc259c3417 Mon Sep 17 00:00:00 2001
From: Gregor Lenz <gregor.lenz@synsense.ai>
Date: Fri, 30 Dec 2022 14:57:54 +0100
Subject: [PATCH] add runtime_checkable to Slicer class to allow type checking
 slicers

---
 tonic/slicers.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tonic/slicers.py b/tonic/slicers.py
index 7905725f..743c556d 100644
--- a/tonic/slicers.py
+++ b/tonic/slicers.py
@@ -1,10 +1,11 @@
 from dataclasses import dataclass
-from typing import Any, List, Tuple
+from typing import Any, List, Tuple, runtime_checkable
 
 import numpy as np
 from typing_extensions import Protocol
 
 
+@runtime_checkable
 class Slicer(Protocol):
     """Base protocol class for slicers in Tonic.
 
@@ -101,7 +102,7 @@ def slice_with_metadata(
         return [data[start:end] for start, end in metadata], targets
 
 
-@dataclass
+@dataclass(frozen=True)
 class SliceByTimeBins:
     """
     Slices data and targets along fixed number of bins of time length time_duration / bin_count * (1 + overlap).