add notes

Author: TsingZ0

README.md

@@ -180,6 +180,8 @@ For more details on datasets and FL algorithms in **IoT**, please refer to [FL-I
 ### Examples for **MNIST** in the ***label skew*** scenario
 ```bash
 cd ./dataset
+# Please modify train_ratio and alpha in dataset\utils\dataset_utils.py
+
 # python generate_MNIST.py iid - - # for iid and unbalanced scenario
 # python generate_MNIST.py iid balance - # for iid and balanced scenario
 # python generate_MNIST.py noniid - pat # for pathological noniid and unbalanced scenario

docs/data.html

@@ -238,6 +238,8 @@ <h3 id="exp-mnist">Examples for <strong>MNIST</strong> in the <em><strong>label
 
 <pre>
 # In ./dataset
+# Please modify train_ratio and alpha in dataset\utils\dataset_utils.py
+
 # python generate_MNIST.py iid - - # for iid and unbalanced scenario
 # python generate_MNIST.py iid balance - # for iid and balanced scenario
 # python generate_MNIST.py noniid - pat # for pathological noniid and unbalanced scenario