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Function maxWeightMatching has a Cognitive Complexity of 479 (exceeds 5 allowed). Consider refactoring.
Open

def maxWeightMatching(edges, maxcardinality=False):
    """Compute a maximum-weighted matching in the general undirected
    weighted graph given by "edges".  If "maxcardinality" is true,
    only maximum-cardinality matchings are considered as solutions.
Severity: Minor
Found in research/van_rantwijk/mwmatching.py - About 1 wk to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

File mwm_general.rb has 579 lines of code (exceeds 250 allowed). Consider refactoring.
Open

require_relative '../graph/weighted_graph'
require_relative '../matching'
require_relative 'matching_algorithm'

module GraphMatching
Severity: Major
Found in lib/graph_matching/algorithm/mwm_general.rb - About 1 day to fix

    File mwmatching.py has 557 lines of code (exceeds 250 allowed). Consider refactoring.
    Open

    """Weighted maximum matching in general graphs.

The algorithm is taken from "Efficient Algorithms for Finding Maximum
Matching in Graphs" by Zvi Galil, ACM Computing Surveys, 1986.
It is based on the "blossom" method for finding augmenting paths and
    Severity: Major
    Found in research/van_rantwijk/mwmatching.py - About 1 day to fix

      Class MWMGeneral has 40 methods (exceeds 20 allowed). Consider refactoring.
      Open

          class MWMGeneral < MatchingAlgorithm
      # If b is a top-level blossom,
      # label[b] is 0 if b is unlabeled (free);
      #             1 if b is an S-vertex/blossom;
      #             2 if b is a T-vertex/blossom.
      Severity: Minor
      Found in lib/graph_matching/algorithm/mwm_general.rb - About 5 hrs to fix

        Method check_delta3 has a Cognitive Complexity of 34 (exceeds 5 allowed). Consider refactoring.
        Open

              def check_delta3
        bk = nil
        bd = nil
        tbk = nil
        tbd = nil
        Severity: Minor
        Found in lib/graph_matching/algorithm/mwmg_delta_assertions.rb - About 5 hrs to fix

        Cognitive Complexity

        Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

        A method's cognitive complexity is based on a few simple rules:

        • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
        • Code is considered more complex for each "break in the linear flow of the code"
        • Code is considered more complex when "flow breaking structures are nested"

        Further reading

        Similar blocks of code found in 3 locations. Consider refactoring.
        Open

                def test32_t_expand_leastslack(self):
            # create blossom, relabel as T, expand such that a new least-slack S-to-free edge is produced, augment
            self.assertEqual(maxWeightMatching([ (1,2,45), (1,5,45), (2,3,50), (3,4,45), (4,5,50), (1,6,30), (3,9,35), (4,8,28), (5,7,26), (9,10,5) ]), [ -1, 6, 3, 2, 8, 7, 1, 5, 4, 10, 9 ])
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 2 other locations - About 4 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 922..924
        research/van_rantwijk/mwmatching.py on lines 926..928

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 83.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Method e has a Cognitive Complexity of 32 (exceeds 5 allowed). Consider refactoring.
        Open

              def e(g)
        first = []
        label = []
        mate = []
        Severity: Minor
        Found in lib/graph_matching/algorithm/mcm_general.rb - About 4 hrs to fix

        Cognitive Complexity

        Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

        A method's cognitive complexity is based on a few simple rules:

        • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
        • Code is considered more complex for each "break in the linear flow of the code"
        • Code is considered more complex when "flow breaking structures are nested"

        Further reading

        Similar blocks of code found in 3 locations. Consider refactoring.
        Open

                def test30_tnasty_expand(self):
            # create blossom, relabel as T in more than one way, expand, augment
            self.assertEqual(maxWeightMatching([ (1,2,45), (1,5,45), (2,3,50), (3,4,45), (4,5,50), (1,6,30), (3,9,35), (4,8,35), (5,7,26), (9,10,5) ]), [ -1, 6, 3, 2, 8, 7, 1, 5, 4, 10, 9 ])
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 2 other locations - About 4 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 926..928
        research/van_rantwijk/mwmatching.py on lines 930..932

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 83.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Similar blocks of code found in 3 locations. Consider refactoring.
        Open

                def test31_tnasty2_expand(self):
            # again but slightly different
            self.assertEqual(maxWeightMatching([ (1,2,45), (1,5,45), (2,3,50), (3,4,45), (4,5,50), (1,6,30), (3,9,35), (4,8,26), (5,7,40), (9,10,5) ]), [ -1, 6, 3, 2, 8, 7, 1, 5, 4, 10, 9 ])
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 2 other locations - About 4 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 922..924
        research/van_rantwijk/mwmatching.py on lines 930..932

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 83.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Method match has a Cognitive Complexity of 29 (exceeds 5 allowed). Consider refactoring.
        Open

              def match
        m = []
        dogs, cats = g.partition
        u = init_duals(cats, dogs)
        Severity: Minor
        Found in lib/graph_matching/algorithm/mwm_bipartite.rb - About 4 hrs to fix

        Cognitive Complexity

        Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

        A method's cognitive complexity is based on a few simple rules:

        • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
        • Code is considered more complex for each "break in the linear flow of the code"
        • Code is considered more complex when "flow breaking structures are nested"

        Further reading

        Method calc_delta has a Cognitive Complexity of 29 (exceeds 5 allowed). Consider refactoring.
        Open

              def calc_delta(max_cardinality)
        delta = nil
        delta_type = nil
        delta_edge = nil
        delta_blossom = nil
        Severity: Minor
        Found in lib/graph_matching/algorithm/mwm_general.rb - About 4 hrs to fix

        Cognitive Complexity

        Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

        A method's cognitive complexity is based on a few simple rules:

        • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
        • Code is considered more complex for each "break in the linear flow of the code"
        • Code is considered more complex when "flow breaking structures are nested"

        Further reading

        Similar blocks of code found in 2 locations. Consider refactoring.
        Open

                def test23_s_relabel_nest(self):
            # create S-blossom, relabel as S, include in nested S-blossom
            self.assertEqual(maxWeightMatching([ (1,2,10), (1,7,10), (2,3,12), (3,4,20), (3,5,20), (4,5,25), (5,6,10), (6,7,10), (7,8,8) ]), [ -1, 2, 1, 4, 3, 6, 5, 8, 7 ])
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 1 other location - About 4 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 918..920

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 76.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Similar blocks of code found in 2 locations. Consider refactoring.
        Open

                def test26_s_nest_t_expand(self):
            # create nested S-blossom, relabel as T, expand
            self.assertEqual(maxWeightMatching([ (1,2,19), (1,3,20), (1,8,8), (2,3,25), (2,4,18), (3,5,18), (4,5,13), (4,7,7), (5,6,7) ]), [ -1, 8, 3, 2, 7, 6, 5, 4, 1 ])
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 1 other location - About 4 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 906..908

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 76.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Similar blocks of code found in 2 locations. Consider refactoring.
        Open

                    assert (label[bv] == 2 or
                    (label[bv] == 1 and labelend[bv] == mate[blossombase[bv]]))
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 1 other location - About 2 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 310..311

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 61.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Similar blocks of code found in 2 locations. Consider refactoring.
        Open

                    assert (label[bw] == 2 or
                    (label[bw] == 1 and labelend[bw] == mate[blossombase[bw]]))
        Severity: Major
        Found in research/van_rantwijk/mwmatching.py and 1 other location - About 2 hrs to fix
        research/van_rantwijk/mwmatching.py on lines 293..294

        Duplicated Code

        Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

        Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

        When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

        Tuning

        This issue has a mass of 61.

        We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

        The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

        If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

        See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

        Refactorings

        Further Reading

        Method add_blossom has 67 lines of code (exceeds 25 allowed). Consider refactoring.
        Open

              def add_blossom(base, k)
        v, w = @edges[k].to_a
        bb = @in_blossom[base]
        bv = @in_blossom[v]
        bw = @in_blossom[w]
        Severity: Major
        Found in lib/graph_matching/algorithm/mwm_general.rb - About 2 hrs to fix

          Method match has a Cognitive Complexity of 19 (exceeds 5 allowed). Consider refactoring.
          Open

                def match
        u = g.partition[0]
        m = []

        loop do
          Severity: Minor
          Found in lib/graph_matching/algorithm/mcm_bipartite.rb - About 2 hrs to fix

          Cognitive Complexity

          Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

          A method's cognitive complexity is based on a few simple rules:

          • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
          • Code is considered more complex for each "break in the linear flow of the code"
          • Code is considered more complex when "flow breaking structures are nested"

          Further reading

          Method check_delta2 has a Cognitive Complexity of 18 (exceeds 5 allowed). Consider refactoring.
          Open

                def check_delta2
        (0...@nvertex).each do |v|
          next unless @label[@in_blossom[v]] == MWMGeneral::LBL_FREE
          bd = nil
          bk = nil
          Severity: Minor
          Found in lib/graph_matching/algorithm/mwmg_delta_assertions.rb - About 2 hrs to fix

          Cognitive Complexity

          Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

          A method's cognitive complexity is based on a few simple rules:

          • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
          • Code is considered more complex for each "break in the linear flow of the code"
          • Code is considered more complex when "flow breaking structures are nested"

          Further reading

          Method match has a Cognitive Complexity of 17 (exceeds 5 allowed). Consider refactoring.
          Open

                def match(max_cardinality)
        return Matching.new if g.num_edges == 0

        # Iterative *stages*.  Each stage augments the matching.
        # There can be at most n stages, where n is num. vertexes.
          Severity: Minor
          Found in lib/graph_matching/algorithm/mwm_general.rb - About 2 hrs to fix

          Cognitive Complexity

          Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

          A method's cognitive complexity is based on a few simple rules:

          • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
          • Code is considered more complex for each "break in the linear flow of the code"
          • Code is considered more complex when "flow breaking structures are nested"

          Further reading

          Similar blocks of code found in 4 locations. Consider refactoring.
          Open

                      self.assertEqual(maxWeightMatching([ (1,2,8), (1,3,9), (2,3,10), (3,4,7), (1,6,5), (4,5,6) ]), [ -1, 6, 3, 2, 5, 4, 1 ])
          Severity: Major
          Found in research/van_rantwijk/mwmatching.py and 3 other locations - About 2 hrs to fix
          research/van_rantwijk/mwmatching.py on lines 898..898
          research/van_rantwijk/mwmatching.py on lines 899..899
          research/van_rantwijk/mwmatching.py on lines 900..900

          Duplicated Code

          Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

          Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

          When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

          Tuning

          This issue has a mass of 53.

          We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

          The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

          If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

          See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

          Refactorings

          Further Reading

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