message: Remove parallel from joblib as it does not improve performances
diff: from sklearn.base import BaseEstimator, TransformerMixin
  -# joblib is required by scikit-learn
  -from joblib import Parallel, delayed
  -
  # Mermaid sequence diagram - https://mermaid-js.github.io/mermaid-live-editor/
  # sequenceDiagram
  # USER->>DimensionSelector: fit_transform(<br/>[[array( H0(X0) ), array( H1(X0) ), ...],<br/> [array( H0(X1) ), array( H1(X1) ), ...],<br/> ...])
  