Better conditional for all the kinds of bands

Signed-off-by: João Lucas de Sousa Almeida <[email protected]>

terratorch/models/backbones/utils.py

@@ -1,31 +1,33 @@
 from terratorch.datasets import HLSBands
 
-def _are_sublists_of_int(item) -> bool:
+def _are_sublists_of_int(item) -> (bool, bool):
 
     if all([isinstance(i, list) for i in item]):
         if all([isinstance(i, int) for i in sum(item, [])]):
-            return True
+            return True, True
         else:
-            return False
+            raise Exception(f"It's expected sublists be [int, int], but rceived {model_bands}")
+    elif len(item) == 2 and type(item[0]) == type(item[1]) == int:
+        return False, True
     else:
-        return False
+        return False, False
 
 def _estimate_in_chans(model_bands: list[HLSBands] | list[str] | tuple[int, int] = None) -> int:
 
     # Conditional to deal with the different possible choices for the bands 
     # Bands as lists of strings or enum
-    if all([isinstance(b, str) or isinstance(b, HLSBands) for b in model_bands]): 
-        in_chans = len(model_bands)
+    is_sublist, requires_special_eval = _are_sublists_of_int(model_bands)
+
     # Bands as intervals limited by integers
-    elif all([isinstance(b, int) for b in model_bands] or _are_sublists_of_int(model_bands)):
+    if requires_special_eval:
 
-        if _are_sublists_of_int(model_bands):
+        if is_sublist:
             in_chans = sum([i[-1] - i[0] for i in model_bands])
         else:
             in_chans = model_bands[-1] - model_bands[0]
     else:
-        raise Exception(f"Expected bands to be list(str) or [int, int] but received {model_bands}")
-    
+        in_chans = len(model_bands) 
+
     return in_chans