Removed extra lines from code

Author: Teris45

src/pyjedai/schema/schema_model.py

@@ -1,8 +1,3 @@
-import networkx as nx
-from nltk.tokenize import word_tokenize
-from nltk.corpus import stopwords
-from nltk.stem import PorterStemmer
-import numpy as np
 import pandas as pd
 from pandas import DataFrame
 from ..datamodel import Data