def get_session_dir(project_dict):
    """Gets the session directory to read from the project_dict

    Parameters
    ----------
    project_dict: dict
    A dictionary containing all the project's json values

    Returns
    -------
    session_base_dir: str
    a string of the session specific paths used by the project
    """
    session_base_dir = project_dict['session_dir']
    return session_base_dir