Remove scikit-learn requirement from native training example (#11368)

samples/native_training/README.md

diff --git a/samples/native_training/README.md b/samples/native_training/README.md
index 135ade4a..d223976 100644
--- a/samples/native_training/README.md
+++ b/samples/native_training/README.md
@@ -29,7 +29,6 @@
 pip install -f https://iree-org.github.io/iree/pip-release-links.html iree-compiler
 pip install -f https://llvm.github.io/torch-mlir/package-index/ torch-mlir
 pip install git+https://github.com/iree-org/iree-torch.git
-pip install scikit-learn
 ```
 
 Update submodules in this repo:
@@ -67,4 +66,4 @@
 
 ```shell
 ./native-training /tmp/native_training.vmfb
-```
\ No newline at end of file
+```