This error occurs because you are trying to import module accumulation-tree, but it is not installed in your python environment.


To install the module, execute the following command in termanal:

 pip install accumulation-tree

To install the module inside Google Colab, Kaggle/Jupyter Notebook or ipython environment, execute the following code line/cell:

 !pip install accumulation-tree

How it works:

pip - is a standard packet manager in python. This program can install missing module in your local development environment or current Google Colab/Kaggle/Jupyter Notebook session.

! - exclamation mark instructs interactive environment to interpret line/cell content as shell command, not as python code. This is needed because pip command should be executed in shell.

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