Define temporary methods to extract blocks, time_sigma_relatives and estimate density.

cml/domain/data_source.py

@@ -108,6 +108,16 @@ class DataSource:
     def __len__(self):
         return self.__source.length
 
+    def get_block(self, indices=None):
+        return self.__source.get_block_via_index(indices)
+
+    def time_sigma_relatives(self, block):
+        return next(iter(self.__learnblock_identifier._identify_relatives(
+            block, "T", "Sigma")))
+
+    def estimate_density(self, data):
+        return self.__learnblock_identifier.density_estimator(data).density()
+
 
 class Preprocessor:
     TIME_COLUMN = "T"