Coverage for gpkit\constraints\prog

1"Scripts for generating, solving and sweeping programs"

2from time import time

3import warnings as pywarnings

4import numpy as np

5from adce import adnumber

6from ..nomials import parse_subs

7from ..solution_array import SolutionArray

8from ..keydict import KeyDict

9from ..small_scripts import maybe_flatten

10from ..small_classes import FixedScalar

11from ..exceptions import Infeasible

12from ..globals import SignomialsEnabled

15def evaluate_linked(constants, linked):

16 "Evaluates the values and gradients of linked variables."

17 kdc = KeyDict({k: adnumber(maybe_flatten(v), k)

18 for k, v in constants.items()})

19 kdc_plain = None

20 array_calulated = {}

21 for key in constants: # remove gradients from constants

22 key.descr.pop("gradients", None)

23 for v, f in linked.items():

24 try:

25 if v.veckey and v.veckey.vecfn:

26 if v.veckey not in array_calulated:

27 with SignomialsEnabled(): # to allow use of gpkit.units

28 vecout = v.veckey.vecfn(kdc)

29 if not hasattr(vecout, "shape"):

30 vecout = np.array(vecout)

31 array_calulated[v.veckey] = vecout

32 out = array_calulated[v.veckey][v.idx]

33 else:

34 with SignomialsEnabled(): # to allow use of gpkit.units

35 out = f(kdc)

36 if isinstance(out, FixedScalar): # to allow use of gpkit.units

37 out = out.value

38 if hasattr(out, "units"):

39 out = out.to(v.units or "dimensionless").magnitude

40 elif out != 0 and v.units:

41 pywarnings.warn(

42 "Linked function for %s did not return a united value."

43 " Modifying it to do so (e.g. by using `()` instead of `[]`"

44 " to access variables) will reduce errors." % v)

45 out = maybe_flatten(out)

46 if not hasattr(out, "x"):

47 constants[v] = out

48 continue # a new fixed variable, not a calculated one

49 constants[v] = out.x

50 v.descr["gradients"] = {adn.tag: grad

51 for adn, grad in out.d().items()

52 if adn.tag}

53 except Exception as exception: # pylint: disable=broad-except

54 from .. import settings

55 if settings.get("ad_errors_raise", None):

56 raise

57 if kdc_plain is None:

58 kdc_plain = KeyDict(constants)

59 constants[v] = f(kdc_plain)

60 v.descr.pop("gradients", None)

61 print("Warning: skipped auto-differentiation of linked variable"

62 " %s because %s was raised. Set `gpkit.settings"

63 "[\"ad_errors_raise\"] = True` to raise such Exceptions"

64 " directly.\n" % (v, repr(exception)))

65 if ("Automatic differentiation not yet supported for <class "

66 "'gpkit.nomials.math.Monomial'> objects") in str(exception):

67 print("This particular warning may have come from using"

68 " gpkit.units.* in the function for %s; try using"

69 " gpkit.ureg.* or gpkit.units.*.units instead." % v)

72def progify(program, return_attr=None):

73 """Generates function that returns a program() and optionally an attribute.

75 Arguments

76 ---------

77 program: NomialData

78 Class to return, e.g. GeometricProgram or SequentialGeometricProgram

79 return_attr: string

80 attribute to return in addition to the program

81 """

82 def programfn(self, constants=None, **initargs):

83 "Return program version of self"

84 if not constants:

85 constants, _, linked = parse_subs(self.varkeys, self.substitutions)

86 if linked:

87 evaluate_linked(constants, linked)

88 prog = program(self.cost, self, constants, **initargs)

89 prog.model = self # NOTE SIDE EFFECTS

90 if return_attr:

91 return prog, getattr(prog, return_attr)

92 return prog

93 return programfn

96def solvify(genfunction):

97 "Returns function for making/solving/sweeping a program."

98 def solvefn(self, solver=None, *, verbosity=1, skipsweepfailures=False,

99 **kwargs):

100 """Forms a mathematical program and attempts to solve it.

101

102 Arguments

103 ---------

104 solver : string or function (default None)

105 If None, uses the default solver found in installation.

106 verbosity : int (default 1)

107 If greater than 0 prints runtime messages.

108 Is decremented by one and then passed to programs.

109 skipsweepfailures : bool (default False)

110 If True, when a solve errors during a sweep, skip it.

111 **kwargs : Passed to solve and program init calls

112

113 Returns

114 -------

115 sol : SolutionArray

116 See the SolutionArray documentation for details.

117

118 Raises

119 ------

120 ValueError if the program is invalid.

121 RuntimeWarning if an error occurs in solving or parsing the solution.

122 """

123 constants, sweep, linked = parse_subs(self.varkeys, self.substitutions)

124 solution = SolutionArray()

125 solution.modelstr = str(self)

126

127 # NOTE SIDE EFFECTS: self.program and self.solution set below

128 if sweep:

129 run_sweep(genfunction, self, solution, skipsweepfailures,

130 constants, sweep, linked, solver, verbosity, **kwargs)

131 else:

132 self.program, progsolve = genfunction(self, **kwargs)

133 result = progsolve(solver, verbosity=verbosity, **kwargs)

134 if kwargs.get("process_result", True):

135 self.process_result(result)

136 solution.append(result)

137 solution.to_arrays()

138 self.solution = solution

139 return solution

140 return solvefn

141

142

143# pylint: disable=too-many-locals,too-many-arguments,too-many-branches,too-many-statements

144def run_sweep(genfunction, self, solution, skipsweepfailures,

145 constants, sweep, linked, solver, verbosity, **kwargs):

146 "Runs through a sweep."

147 # sort sweeps by the eqstr of their varkey

148 sweepvars, sweepvals = zip(*sorted(list(sweep.items()),

149 key=lambda vkval: vkval[0].eqstr))

150 if len(sweep) == 1:

151 sweep_grids = np.array(list(sweepvals))

152 else:

153 sweep_grids = np.meshgrid(*list(sweepvals))

154

155 N_passes = sweep_grids[0].size

156 sweep_vects = {var: grid.reshape(N_passes)

157 for (var, grid) in zip(sweepvars, sweep_grids)}

158

159 if verbosity > 0:

160 print("Sweeping with %i solves:" % N_passes)

161 tic = time()

162

163 self.program = []

164 last_error = None

165 for i in range(N_passes):

166 constants.update({var: sweep_vect[i]

167 for (var, sweep_vect) in sweep_vects.items()})

168 if linked:

169 evaluate_linked(constants, linked)

170 program, solvefn = genfunction(self, constants, **kwargs)

171 program.model = None # so it doesn't try to debug

172 self.program.append(program) # NOTE: SIDE EFFECTS

173 try:

174 if verbosity > 1:

175 print("\nSolve %i:" % i)

176 result = solvefn(solver, verbosity=verbosity-1, **kwargs)

177 if kwargs.get("process_result", True):

178 self.process_result(result)

179 solution.append(result)

180 except Infeasible as e:

181 last_error = e

182 if not skipsweepfailures:

183 raise RuntimeWarning(

184 "Solve %i was infeasible; progress saved to m.program."

185 " To continue sweeping after failures, solve with"

186 " skipsweepfailures=True." % i) from e

187 if verbosity > 0:

188 print("Solve %i was %s." % (i, e.__class__.__name__))

189 if not solution:

190 raise RuntimeWarning("All solves were infeasible.") from last_error

191

192 solution["sweepvariables"] = KeyDict()

193 ksweep = KeyDict(sweep)

194 for var, val in list(solution["constants"].items()):

195 if var in ksweep:

196 solution["sweepvariables"][var] = val

197 del solution["constants"][var]

198 elif linked: # if any variables are linked, we check all of them

199 if hasattr(val[0], "shape"):

200 differences = ((l != val[0]).any() for l in val[1:])

201 else:

202 differences = (l != val[0] for l in val[1:])

203 if not any(differences):

204 solution["constants"][var] = [val[0]]

205 else:

206 solution["constants"][var] = [val[0]]

207

208 if verbosity > 0:

209 soltime = time() - tic

210 print("Sweeping took %.3g seconds." % (soltime,))

Coverage for gpkit\constraints\prog_factories.py: 0%

130 statements