File graph.py has 488 lines of code (exceeds 250 allowed). Consider refactoring.

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#
#  graph.py
#
#  Copyright (c) 2016-2023 Junpei Kawamoto
#

Function psi has a Cognitive Complexity of 24 (exceeds 5 allowed). Consider refactoring.

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def psi(u_label: UserLabel, p_label: ProductLabel, r_label: ReviewLabel, epsilon: float) -> float:
    """Likelihood of a pair of user and product.
 
    The likelihood is dependent on the review of the user gives the product.
    The review is one of {+, -}. We defined constant representing "+" and "-",

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Function update has a Cognitive Complexity of 18 (exceeds 5 allowed). Consider refactoring.

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    def update(self) -> float:
        """Update reviewers' anomalous scores and products' summaries.
 
        For each user :math:`u`, update messages to every product :math:`p`
        the user reviews. The message function :math:`m_{u\\rightarrow p}`

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Function add_review has 5 arguments (exceeds 4 allowed). Consider refactoring.

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    def add_review(self, reviewer: Reviewer, product: Product, rating: float, *_args: Any, **_kwargs: Any) -> Review:

Avoid too many return statements within this function.

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                return epsilon

Avoid too many return statements within this function.

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                return 2 * epsilon

Avoid too many return statements within this function.

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                return 1 - 2 * epsilon

Avoid too many return statements within this function.

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                return 1 - epsilon