try

Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:latest
 RUN apt-get update && \
     apt-get install -y python3-pip
 
-RUN pip3 install --user kaggle pandas scikit-learn sklearn
+RUN pip3 install --user kaggle pandas scikit-learn
 
 ENV PATH="/root/.local/bin:${PATH}"
 

data_processing.py

@@ -1,6 +1,6 @@
-import sklearn
+import scikit-learn as sklearn
-from sklearn.preprocessing import OneHotEncoder
+from scikit-learn.preprocessing import OneHotEncoder
-from sklearn.model_selection import train_test_split
+from scikit-learn.model_selection import train_test_split
 import pandas as pd
 import subprocess