From 09a502aba499be0fc690e6e8145755f43bc79704 Mon Sep 17 00:00:00 2001
From: Sergiy Matusevych <sergiym@microsoft.com>
Date: Wed, 14 Aug 2024 20:09:41 -0700
Subject: [PATCH] add quantization_bins check

---
 mlos_bench/mlos_bench/optimizers/convert_configspace.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mlos_bench/mlos_bench/optimizers/convert_configspace.py b/mlos_bench/mlos_bench/optimizers/convert_configspace.py
index 97a10ac489f..ad7968cf69a 100644
--- a/mlos_bench/mlos_bench/optimizers/convert_configspace.py
+++ b/mlos_bench/mlos_bench/optimizers/convert_configspace.py
@@ -60,6 +60,9 @@ def _monkey_patch_quantization(hp: NumericalHyperparameter, quantization_bins: i
     quantization_bins : int
         Number of bins to quantize the hyperparameter into.
     """
+    if quantization_bins <= 1:
+        raise ValueError(f"{quantization_bins=} :: must be greater than 1.")
+
     # Temporary workaround to dropped quantization support in ConfigSpace 1.0
     # See Also: https://github.com/automl/ConfigSpace/issues/390
     if not hasattr(hp, "sample_value_mlos_orig"):