def METHOD_NAME(collection, name):
    """
    Return a light instance of Sample_class, where 'light' means 'without eigenvalues, Fourier coefficients or explicit formula'.
    """
    query = {'collection': {'$contains': [collection]}, 'name': name}
    doc = db.smf_samples.lucky(query, {'Fourier_coefficients': False, 'eigenvalues': False, 'explicit_formula': False})
    return Sample_class(doc) if doc else None