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qutip/qutip-qip

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src/qutip_qip/transpiler/chain.py

Summary

Maintainability
F
4 days
Test Coverage

Function to_chain_structure has a Cognitive Complexity of 141 (exceeds 20 allowed). Consider refactoring.
Open

def to_chain_structure(qc, setup="linear"):
    """
    Method to resolve 2 qubit gates with non-adjacent control/s or target/s
    in terms of gates with adjacent interactions for linear/circular spin
    chain system.
Severity: Minor
Found in src/qutip_qip/transpiler/chain.py - About 2 days 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

Avoid deeply nested control flow statements.
Open

                    if start + end - i - i == 1 and (end - start + 1) % 2 == 0:
                        # Apply required gate if control and target are
                        # adjacent to each other, provided |control-target|
                        # is even.
                        if end == gate.controls[0]:
Severity: Major
Found in src/qutip_qip/transpiler/chain.py - About 45 mins to fix

    Avoid deeply nested control flow statements.
    Open

                        if (
                        N + start - end - i - i == 1
                        and (N - end + start + 1) % 2 == 0
                    ):
                        temp.add_gate(gate.name, [i, i + 1])
    Severity: Major
    Found in src/qutip_qip/transpiler/chain.py - About 45 mins to fix

      Avoid deeply nested control flow statements.
      Open

                          if j < N - end - 2:
                        qc_t.add_gate(
                            gate.name,
                            [end + gate.targets[0], end + gate.targets[1]],
                        )
      Severity: Major
      Found in src/qutip_qip/transpiler/chain.py - About 45 mins to fix

        Avoid deeply nested control flow statements.
        Open

                            if j < N - end - 2:
                        if gate.name in ["CNOT", "CSIGN"]:
                            qc_t.add_gate(
                                gate.name,
                                end + gate.targets[0],
        Severity: Major
        Found in src/qutip_qip/transpiler/chain.py - About 45 mins to fix

          Avoid deeply nested control flow statements.
          Open

                              if (
                        N + start - end - i - i == 1
                        and (N - end + start + 1) % 2 == 0
                    ):
                        if end == gate.controls[0]:
          Severity: Major
          Found in src/qutip_qip/transpiler/chain.py - About 45 mins to fix

            Avoid deeply nested control flow statements.
            Open

                                if start + end - i - i == 1 and (end - start + 1) % 2 == 0:
                        qc_t.add_gate(gate.name, [i, i + 1])
                    elif (start + end - i - i) == 2 and (
                        end - start + 1
                    ) % 2 == 1:
            Severity: Major
            Found in src/qutip_qip/transpiler/chain.py - About 45 mins to fix

              FIXME found
              Open

                  # FIXME This huge block has been here for a long time.
              Severity: Minor
              Found in src/qutip_qip/transpiler/chain.py by fixme

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

                                  elif (
                        start + end - i - i == 2 and (end - start + 1) % 2 == 1
                    ):
                        # Apply a swap between i and its adjacent gate,
                        # then the required gate if and then another swap
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 1 other location - About 6 hrs to fix
              src/qutip_qip/transpiler/chain.py on lines 117..131

              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 136.

              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

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

                                  elif (
                        N + start - end - i - i == 2
                        and (N - end + start + 1) % 2 == 1
                    ):
                        temp.add_gate("SWAP", targets=[i, i + 1])
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 1 other location - About 1 hr to fix
              src/qutip_qip/transpiler/chain.py on lines 225..238

              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 75.

              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

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

                                  elif (
                        N + start - end - i - i == 2
                        and (N - end + start + 1) % 2 == 1
                    ):
                        temp.add_gate("SWAP", [i, i + 1])
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 1 other location - About 1 hr to fix
              src/qutip_qip/transpiler/chain.py on lines 117..137

              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 75.

              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

                                  if start + end - i - i == 1 and (end - start + 1) % 2 == 0:
                        # Apply required gate if control and target are
                        # adjacent to each other, provided |control-target|
                        # is even.
                        if end == gate.controls[0]:
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 1 other location - About 1 hr to fix
              src/qutip_qip/transpiler/chain.py on lines 104..114

              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 75.

              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

                                  elif (start + end - i - i) == 2 and (
                        end - start + 1
                    ) % 2 == 1:
                        qc_t.add_gate("SWAP", [i, i + 1])
                        qc_t.add_gate(gate.name, [i + 1, i + 2])
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 1 other location - About 1 hr to fix
              src/qutip_qip/transpiler/chain.py on lines 225..232

              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 73.

              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 4 locations. Consider refactoring.
              Open

                                  if (
                        N + start - end - i - i == 1
                        and (N - end + start + 1) % 2 == 0
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 3 other locations - About 40 mins to fix
              src/qutip_qip/transpiler/chain.py on lines 117..119
              src/qutip_qip/transpiler/chain.py on lines 219..221
              src/qutip_qip/transpiler/chain.py on lines 225..227

              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 66.

              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 4 locations. Consider refactoring.
              Open

                                  if (
                        N + start - end - i - i == 1
                        and (N - end + start + 1) % 2 == 0
              Severity: Major
              Found in src/qutip_qip/transpiler/chain.py and 3 other locations - About 40 mins to fix
              src/qutip_qip/transpiler/chain.py on lines 104..106
              src/qutip_qip/transpiler/chain.py on lines 117..119
              src/qutip_qip/transpiler/chain.py on lines 225..227

              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 66.

              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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