def estimator(self):
        """Get the estimator, an instance of a (subclass of)
        sklearn.base.BaseEstimator

        It can be loaded either from a pickle, from a string using eval(),
        or from an entry point.

        e.g.

        estimator:
            # only one of the following can actually be active in a given
            # config file.
            pickle: path-to-pickle-file.pkl
            eval: "Pipeline([('cluster': KMeans())])"
            entry_point: sklearn.linear_model.LogisticRegression
            module: myestimator
        """
        module_path = self.get_value('estimator/module')
        if module_path is not None:
            with prepend_syspath(dirname(abspath(self.path))):
                estimator_module = importlib.import_module(module_path)
            estimator = estimator_module.estimator()
            if not isinstance(estimator, sklearn.base.BaseEstimator):
                raise RuntimeError('estimator/pickle must load a '
                                   'sklearn-derived Estimator')
            return estimator

        evalstring = self.get_value('estimator/eval')
        if evalstring is not None:
            got = self.get_value('estimator/eval_scope')
            if isinstance(got, six.string_types):
                got = [got]
            elif isinstance(got, list):
                pass
            else:
                raise RuntimeError('unexpected type for estimator/eval_scope')

            scope = {}
            for pkg_name in got:
                if pkg_name in eval_scopes.__all__:
                    scope.update(getattr(eval_scopes, pkg_name)())
                else:
                    try:
                        pkg = importlib.import_module(pkg_name)
                    except ImportError as e:
                        raise RuntimeError(str(e))
                    scope.update(eval_scopes.import_all_estimators(pkg))

            try:
                estimator = eval(evalstring, {}, scope)
                if not isinstance(estimator, sklearn.base.BaseEstimator):
                    raise RuntimeError('estimator/pickle must load a '
                                       'sklearn-derived Estimator')
                return estimator
            except:
                print('-'*78, file=sys.stderr)
                print('Error parsing estimator/eval', file=sys.stderr)
                print('-'*78, file=sys.stderr)

                traceback.print_exc(file=sys.stderr)
                print('-'*78, file=sys.stderr)
                sys.exit(1)

        entry_point = self.get_value('estimator/entry_point')
        if entry_point is not None:
            estimator = load_entry_point(entry_point, 'estimator/entry_point')
            if issubclass(estimator, sklearn.base.BaseEstimator):
                estimator = estimator(
                    **self.get_value('estimator/params', default={}))
            if not isinstance(estimator, sklearn.base.BaseEstimator):
                raise RuntimeError('estimator/pickle must load a '
                                   'sklearn-derived Estimator')
            return estimator

        # load estimator from pickle field
        pkl = self.get_value('estimator/pickle')
        if pkl is not None:
            pickl_dir = dirname(abspath(self.path))
            path = join(pickl_dir, pkl)
            if not isfile(path):
                raise RuntimeError('estimator/pickle %s is not a file' % pkl)
            with open(path, 'rb') as f:
                with prepend_syspath(pickl_dir):
                    estimator = cPickle.load(f)
                if not isinstance(estimator, sklearn.base.BaseEstimator):
                    raise RuntimeError('estimator/pickle must load a '
                                       'sklearn-derived Estimator')
                return estimator

        raise RuntimeError('no estimator field')
def estimator(self):
        """Get the estimator, an instance of a (subclass of)
        sklearn.base.BaseEstimator

        It can be loaded either from a pickle, from a string using eval(),
        or from an entry point.

        e.g.

        estimator:
            # only one of the following can actually be active in a given
            # config file.
            pickle: path-to-pickle-file.pkl
            eval: "Pipeline([('cluster': KMeans())])"
            entry_point: sklearn.linear_model.LogisticRegression
            module: myestimator
        """
        module_path = self.get_value('estimator/module')
        if module_path is not None:
            with prepend_syspath(dirname(abspath(self.path))):
                estimator_module = importlib.import_module(module_path)
            estimator = estimator_module.estimator()
            if not isinstance(estimator, sklearn.base.BaseEstimator):
                raise RuntimeError('estimator/pickle must load a '
                                   'sklearn-derived Estimator')
            return estimator

        evalstring = self.get_value('estimator/eval')
        if evalstring is not None:
            got = self.get_value('estimator/eval_scope')
            if isinstance(got, six.string_types):
                got = [got]
            elif isinstance(got, list):
                pass
            else:
                raise RuntimeError('unexpected type for estimator/eval_scope')

            scope = {}
            for pkg_name in got:
                if pkg_name in eval_scopes.__all__:
                    scope.update(getattr(eval_scopes, pkg_name)())
                else:
                    try:
                        pkg = importlib.import_module(pkg_name)
                    except ImportError as e:
                        raise RuntimeError(str(e))
                    scope.update(eval_scopes.import_all_estimators(pkg))

            try:
                estimator = eval(evalstring, {}, scope)
                if not isinstance(estimator, sklearn.base.BaseEstimator):
                    raise RuntimeError('estimator/pickle must load a '
                                       'sklearn-derived Estimator')
                return estimator
            except:
                print('-'*78, file=sys.stderr)
                print('Error parsing estimator/eval', file=sys.stderr)
                print('-'*78, file=sys.stderr)

                traceback.print_exc(file=sys.stderr)
                print('-'*78, file=sys.stderr)
                sys.exit(1)

        entry_point = self.get_value('estimator/entry_point')
        if entry_point is not None:
            estimator = load_entry_point(entry_point, 'estimator/entry_point')
            if issubclass(estimator, sklearn.base.BaseEstimator):
                estimator = estimator(
                    **self.get_value('estimator/params', default={}))
            if not isinstance(estimator, sklearn.base.BaseEstimator):
                raise RuntimeError('estimator/pickle must load a '
                                   'sklearn-derived Estimator')
            return estimator

        # load estimator from pickle field
        pkl = self.get_value('estimator/pickle')
        if pkl is not None:
            pickl_dir = dirname(abspath(self.path))
            path = join(pickl_dir, pkl)
            if not isfile(path):
                raise RuntimeError('estimator/pickle %s is not a file' % pkl)
            with open(path, 'rb') as f:
                with prepend_syspath(pickl_dir):
                    estimator = cPickle.load(f)
                if not isinstance(estimator, sklearn.base.BaseEstimator):
                    raise RuntimeError('estimator/pickle must load a '
                                       'sklearn-derived Estimator')
                return estimator

        raise RuntimeError('no estimator field')
def estimator ( self ) : module_path = self . get_value ( 'estimator/module' ) if module_path is not None : with prepend_syspath ( dirname ( abspath ( self . path ) ) ) : estimator_module = importlib . import_module ( module_path ) estimator = estimator_module . estimator ( ) if not isinstance ( estimator , sklearn . base . BaseEstimator ) : raise RuntimeError ( 'estimator/pickle must load a ' 'sklearn-derived Estimator' ) return estimator evalstring = self . get_value ( 'estimator/eval' ) if evalstring is not None : got = self . get_value ( 'estimator/eval_scope' ) if isinstance ( got , six . string_types ) : got = [ got ] elif isinstance ( got , list ) : pass else : raise RuntimeError ( 'unexpected type for estimator/eval_scope' ) scope = { } for pkg_name in got : if pkg_name in eval_scopes . __all__ : scope . update ( getattr ( eval_scopes , pkg_name ) ( ) ) else : try : pkg = importlib . import_module ( pkg_name ) except ImportError as e : raise RuntimeError ( str ( e ) ) scope . update ( eval_scopes . import_all_estimators ( pkg ) ) try : estimator = eval ( evalstring , { } , scope ) if not isinstance ( estimator , sklearn . base . BaseEstimator ) : raise RuntimeError ( 'estimator/pickle must load a ' 'sklearn-derived Estimator' ) return estimator except : print ( '-' * 78 , file = sys . stderr ) print ( 'Error parsing estimator/eval' , file = sys . stderr ) print ( '-' * 78 , file = sys . stderr ) traceback . print_exc ( file = sys . stderr ) print ( '-' * 78 , file = sys . stderr ) sys . exit ( 1 ) entry_point = self . get_value ( 'estimator/entry_point' ) if entry_point is not None : estimator = load_entry_point ( entry_point , 'estimator/entry_point' ) if issubclass ( estimator , sklearn . base . BaseEstimator ) : estimator = estimator ( * * self . get_value ( 'estimator/params' , default = { } ) ) if not isinstance ( estimator , sklearn . base . BaseEstimator ) : raise RuntimeError ( 'estimator/pickle must load a ' 'sklearn-derived Estimator' ) return estimator # load estimator from pickle field pkl = self . get_value ( 'estimator/pickle' ) if pkl is not None : pickl_dir = dirname ( abspath ( self . path ) ) path = join ( pickl_dir , pkl ) if not isfile ( path ) : raise RuntimeError ( 'estimator/pickle %s is not a file' % pkl ) with open ( path , 'rb' ) as f : with prepend_syspath ( pickl_dir ) : estimator = cPickle . load ( f ) if not isinstance ( estimator , sklearn . base . BaseEstimator ) : raise RuntimeError ( 'estimator/pickle must load a ' 'sklearn-derived Estimator' ) return estimator raise RuntimeError ( 'no estimator field' )
Get the estimator, an instance of a (subclass of)
        sklearn.base.BaseEstimator

        It can be loaded either from a pickle, from a string using eval(),
        or from an entry point.

        e.g.

        estimator:
            # only one of the following can actually be active in a given
            # config file.
            pickle: path-to-pickle-file.pkl
            eval: "Pipeline([('cluster': KMeans())])"
            entry_point: sklearn.linear_model.LogisticRegression
            module: myestimator
Get the estimator an instance of a ( subclass of ) sklearn . base . BaseEstimator