Only consider DelayedSample objects

bob/pipelines/sample_loaders.py

@@ -89,7 +89,7 @@ class CSVToSampleLoader(TransformerMixin, BaseEstimator):
         # samples can contain lists of samples, unpack if it's the case
         unpacked_samples = []
         for e in samples:
-            if isinstance(e, (Sample, DelayedSample)):
+            if isinstance(e, DelayedSample):
                 unpacked_samples.append(e)
             else:
                 unpacked_samples.extend(e)