adds a filter for future dmc use

deepdog/direct_monte_carlo/compose_filter.py

@@ -0,0 +1,14 @@
+from typing import Sequence
+from deepdog.direct_monte_carlo.direct_mc import DirectMonteCarloFilter
+import numpy
+
+
+class ComposedDMCFilter(DirectMonteCarloFilter):
+	def __init__(self, filters: Sequence[DirectMonteCarloFilter]):
+		self.filters = filters
+
+	def filter_samples(self, samples: numpy.ndarray) -> numpy.ndarray:
+		current_sample = samples
+		for filter in self.filters:
+			current_sample = filter.filter_samples(current_sample)
+		return current_sample