terratorch.models.backbones.utils

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

terratorch/models/backbones/utils.py

@@ -0,0 +1,31 @@
+from terratorch.datasets import HLSBands
+
+def _are_sublists_of_int(item) -> bool:
+
+    if all([isinstance(i, list) for i in item]):
+        if all([isinstance(i, int) for i in sum(item, [])]):
+            return True
+        else:
+            return False
+    else:
+        return 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) for b in model_bands]): 
+        in_chans = len(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 _are_sublists_of_int(model_bands):
+            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}")
+
+    return in_chans
+
+