Tests: Fix seed of numpy.random

tests/sklearn/test_sklearn_isolationforest.py

tests/sklearn/test_sklearn_knn.py

tests/sklearn/test_sklearn_linearregression.py

tests/sklearn/test_sklearn_lvq.py

tests/sklearn/test_sklearn_naivebayes.py

tests/sklearn/test_sklearn_pipeline.py

tests/sklearn/test_sklearn_randomforest.py

tests/sklearn/test_sklearn_softmaxregression.py

tests/tfkeras/test_tfkeras_linearregression.py

tests/tfkeras/test_tfkeras_softmaxregression.py

tests/torch/test_torch_linearregression.py

tests/torch/test_torch_softmaxregression.py