69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
# Copyright 2010-2022 Google LLC
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""helpers methods for the cp_model_builder module."""
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import numbers
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import numpy as np
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from ortools.linear_solver import linear_solver_pb2
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from ortools.model_builder.python import pywrap_model_builder_helper
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# Used by CVXPY.
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class ModelSolverHelper(pywrap_model_builder_helper.ModelSolverHelper):
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def Solve(
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self, request: linear_solver_pb2.MPModelRequest
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) -> linear_solver_pb2.MPSolutionResponse:
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return linear_solver_pb2.MPSolutionResponse.FromString(
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super().solve_serialized_request(request.SerializeToString()))
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def is_integral(x):
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"""Checks if x has either a number.Integral or a np.integer type."""
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return isinstance(x, numbers.Integral) or isinstance(x, np.integer)
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def is_a_number(x):
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"""Checks if x has either a number.Number or a np.double type."""
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return isinstance(x, numbers.Number) or isinstance(
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x, np.double) or isinstance(x, np.integer)
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def is_zero(x):
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"""Checks if the x is 0 or 0.0."""
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return (is_integral(x) and int(x) == 0) or (is_a_number(x) and
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float(x) == 0.0)
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def is_one(x):
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"""Checks if x is 1 or 1.0."""
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return (is_integral(x) and int(x) == 1) or (is_a_number(x) and
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float(x) == 1.0)
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def is_minus_one(x):
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"""Checks if x is -1 or -1.0."""
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return (is_integral(x) and int(x) == -1) or (is_a_number(x) and
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float(x) == -1.0)
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def assert_is_a_number(x):
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"""Asserts that x is a number and returns it."""
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if not is_a_number(x):
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raise TypeError('Not an number: %s' % x)
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elif is_integral(x):
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return int(x)
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else:
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return float(x)
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