change exception to warnings, add positive constraints

mqboost/__init__.py

@@ -3,4 +3,4 @@
 from mqboost.optimize import MQOptimizer
 from mqboost.regressor import MQRegressor
 
-__version__ = "0.2.3"
+__version__ = "0.2.4"

mqboost/utils.py

@@ -1,3 +1,4 @@
+import warnings
 from itertools import chain, repeat
 from typing import List
 
@@ -100,7 +101,10 @@ def delta_validate(delta: float) -> float:
     if not isinstance(delta, float):
         raise ValidationException("Delta is not float type")
 
+    if delta <= 0:
+        raise ValidationException("Delta must be positive")
+
     if delta > _delta_upper_bound:
-        raise ValidationException("Delta must be smaller than or equal to 0.05")
+        warnings.warn("Delta should be 0.05 or less.")
 
     return delta

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "mqboost"
-version = "0.2.3"
+version = "0.2.4"
 description = "Monotonic composite quantile gradient boost regressor"
 authors = ["RektPunk <[email protected]>"]
 readme = "README.md"