def suggest(self, history, searchspace):
        """
        Suggest params to maximize an objective function based on the
        function evaluation history using a tree of Parzen estimators (TPE),
        as implemented in the hyperopt package.

        Use of this function requires that hyperopt be installed.
        """
        # This function is very odd, because as far as I can tell there's
        # no real documented API for any of the internals of hyperopt. Its
        # execution model is that hyperopt calls your objective function
        # (instead of merely providing you with suggested points, and then
        # you calling the function yourself), and its very tricky (for me)
        # to use the internal hyperopt data structures to get these predictions
        # out directly.

        # so they path we take in this function is to construct a synthetic
        # hyperopt.Trials database which from the `history`, and then call
        # hyoperopt.fmin with a dummy objective function that logs the value
        # used, and then return that value to our client.

        # The form of the hyperopt.Trials database isn't really documented in
        # the code -- most of this comes from reverse engineering it, by
        # running fmin() on a simple function and then inspecting the form of
        # the resulting trials object.
        if 'hyperopt' not in sys.modules:
            raise ImportError('No module named hyperopt')

        random = check_random_state(self.seed)
        hp_searchspace = searchspace.to_hyperopt()

        trials = Trials()
        for i, (params, scores, status) in enumerate(history):
            if status == 'SUCCEEDED':
                # we're doing maximization, hyperopt.fmin() does minimization,
                # so we need to swap the sign
                result = {'loss': -np.mean(scores), 'status': STATUS_OK}
            elif status == 'PENDING':
                result = {'status': STATUS_RUNNING}
            elif status == 'FAILED':
                result = {'status': STATUS_FAIL}
            else:
                raise RuntimeError('unrecognized status: %s' % status)

            # the vals key in the trials dict is basically just the params
            # dict, but enum variables (hyperopt hp.choice() nodes) are
            # different, because the index of the parameter is specified
            # in vals, not the parameter itself.

            vals = {}
            for var in searchspace:
                if isinstance(var, EnumVariable):
                    # get the index in the choices of the parameter, and use
                    # that.
                    matches = [
                        i for i, c in enumerate(var.choices)
                        if c == params[var.name]
                    ]
                    assert len(matches) == 1
                    vals[var.name] = matches
                else:
                    # the other big difference is that all of the param values
                    # are wrapped in length-1 lists.
                    vals[var.name] = [params[var.name]]

            trials.insert_trial_doc({
                'misc': {
                    'cmd': ('domain_attachment', 'FMinIter_Domain'),
                    'idxs': dict((k, [i]) for k in hp_searchspace.keys()),
                    'tid': i,
                    'vals': vals,
                    'workdir': None
                },
                'result': result,
                'tid': i,
                # bunch of fixed fields that hyperopt seems to require
                'owner': None,
                'spec': None,
                'state': 2,
                'book_time': None,
                'exp_key': None,
                'refresh_time': None,
                'version': 0
            })

        trials.refresh()
        chosen_params_container = []

        def suggest(*args, **kwargs):
            return tpe.suggest(*args,
                               **kwargs,
                               gamma=self.gamma,
                               n_startup_jobs=self.seeds)

        def mock_fn(x):
            # http://stackoverflow.com/a/3190783/1079728
            # to get around no nonlocal keywork in python2
            chosen_params_container.append(x)
            return 0

        fmin(fn=mock_fn,
             algo=tpe.suggest,
             space=hp_searchspace,
             trials=trials,
             max_evals=len(trials.trials) + 1,
             **self._hyperopt_fmin_random_kwarg(random))
        chosen_params = chosen_params_container[0]

        return chosen_params
def suggest(self, history, searchspace):
        """
        Suggest params to maximize an objective function based on the
        function evaluation history using a tree of Parzen estimators (TPE),
        as implemented in the hyperopt package.

        Use of this function requires that hyperopt be installed.
        """
        # This function is very odd, because as far as I can tell there's
        # no real documented API for any of the internals of hyperopt. Its
        # execution model is that hyperopt calls your objective function
        # (instead of merely providing you with suggested points, and then
        # you calling the function yourself), and its very tricky (for me)
        # to use the internal hyperopt data structures to get these predictions
        # out directly.

        # so they path we take in this function is to construct a synthetic
        # hyperopt.Trials database which from the `history`, and then call
        # hyoperopt.fmin with a dummy objective function that logs the value
        # used, and then return that value to our client.

        # The form of the hyperopt.Trials database isn't really documented in
        # the code -- most of this comes from reverse engineering it, by
        # running fmin() on a simple function and then inspecting the form of
        # the resulting trials object.
        if 'hyperopt' not in sys.modules:
            raise ImportError('No module named hyperopt')

        random = check_random_state(self.seed)
        hp_searchspace = searchspace.to_hyperopt()

        trials = Trials()
        for i, (params, scores, status) in enumerate(history):
            if status == 'SUCCEEDED':
                # we're doing maximization, hyperopt.fmin() does minimization,
                # so we need to swap the sign
                result = {'loss': -np.mean(scores), 'status': STATUS_OK}
            elif status == 'PENDING':
                result = {'status': STATUS_RUNNING}
            elif status == 'FAILED':
                result = {'status': STATUS_FAIL}
            else:
                raise RuntimeError('unrecognized status: %s' % status)

            # the vals key in the trials dict is basically just the params
            # dict, but enum variables (hyperopt hp.choice() nodes) are
            # different, because the index of the parameter is specified
            # in vals, not the parameter itself.

            vals = {}
            for var in searchspace:
                if isinstance(var, EnumVariable):
                    # get the index in the choices of the parameter, and use
                    # that.
                    matches = [
                        i for i, c in enumerate(var.choices)
                        if c == params[var.name]
                    ]
                    assert len(matches) == 1
                    vals[var.name] = matches
                else:
                    # the other big difference is that all of the param values
                    # are wrapped in length-1 lists.
                    vals[var.name] = [params[var.name]]

            trials.insert_trial_doc({
                'misc': {
                    'cmd': ('domain_attachment', 'FMinIter_Domain'),
                    'idxs': dict((k, [i]) for k in hp_searchspace.keys()),
                    'tid': i,
                    'vals': vals,
                    'workdir': None
                },
                'result': result,
                'tid': i,
                # bunch of fixed fields that hyperopt seems to require
                'owner': None,
                'spec': None,
                'state': 2,
                'book_time': None,
                'exp_key': None,
                'refresh_time': None,
                'version': 0
            })

        trials.refresh()
        chosen_params_container = []

        def suggest(*args, **kwargs):
            return tpe.suggest(*args,
                               **kwargs,
                               gamma=self.gamma,
                               n_startup_jobs=self.seeds)

        def mock_fn(x):
            # http://stackoverflow.com/a/3190783/1079728
            # to get around no nonlocal keywork in python2
            chosen_params_container.append(x)
            return 0

        fmin(fn=mock_fn,
             algo=tpe.suggest,
             space=hp_searchspace,
             trials=trials,
             max_evals=len(trials.trials) + 1,
             **self._hyperopt_fmin_random_kwarg(random))
        chosen_params = chosen_params_container[0]

        return chosen_params
def suggest ( self , history , searchspace ) : # This function is very odd, because as far as I can tell there's # no real documented API for any of the internals of hyperopt. Its # execution model is that hyperopt calls your objective function # (instead of merely providing you with suggested points, and then # you calling the function yourself), and its very tricky (for me) # to use the internal hyperopt data structures to get these predictions # out directly. # so they path we take in this function is to construct a synthetic # hyperopt.Trials database which from the `history`, and then call # hyoperopt.fmin with a dummy objective function that logs the value # used, and then return that value to our client. # The form of the hyperopt.Trials database isn't really documented in # the code -- most of this comes from reverse engineering it, by # running fmin() on a simple function and then inspecting the form of # the resulting trials object. if 'hyperopt' not in sys . modules : raise ImportError ( 'No module named hyperopt' ) random = check_random_state ( self . seed ) hp_searchspace = searchspace . to_hyperopt ( ) trials = Trials ( ) for i , ( params , scores , status ) in enumerate ( history ) : if status == 'SUCCEEDED' : # we're doing maximization, hyperopt.fmin() does minimization, # so we need to swap the sign result = { 'loss' : - np . mean ( scores ) , 'status' : STATUS_OK } elif status == 'PENDING' : result = { 'status' : STATUS_RUNNING } elif status == 'FAILED' : result = { 'status' : STATUS_FAIL } else : raise RuntimeError ( 'unrecognized status: %s' % status ) # the vals key in the trials dict is basically just the params # dict, but enum variables (hyperopt hp.choice() nodes) are # different, because the index of the parameter is specified # in vals, not the parameter itself. vals = { } for var in searchspace : if isinstance ( var , EnumVariable ) : # get the index in the choices of the parameter, and use # that. matches = [ i for i , c in enumerate ( var . choices ) if c == params [ var . name ] ] assert len ( matches ) == 1 vals [ var . name ] = matches else : # the other big difference is that all of the param values # are wrapped in length-1 lists. vals [ var . name ] = [ params [ var . name ] ] trials . insert_trial_doc ( { 'misc' : { 'cmd' : ( 'domain_attachment' , 'FMinIter_Domain' ) , 'idxs' : dict ( ( k , [ i ] ) for k in hp_searchspace . keys ( ) ) , 'tid' : i , 'vals' : vals , 'workdir' : None } , 'result' : result , 'tid' : i , # bunch of fixed fields that hyperopt seems to require 'owner' : None , 'spec' : None , 'state' : 2 , 'book_time' : None , 'exp_key' : None , 'refresh_time' : None , 'version' : 0 } ) trials . refresh ( ) chosen_params_container = [ ] def suggest ( * args , * * kwargs ) : return tpe . suggest ( * args , * * kwargs , gamma = self . gamma , n_startup_jobs = self . seeds ) def mock_fn ( x ) : # http://stackoverflow.com/a/3190783/1079728 # to get around no nonlocal keywork in python2 chosen_params_container . append ( x ) return 0 fmin ( fn = mock_fn , algo = tpe . suggest , space = hp_searchspace , trials = trials , max_evals = len ( trials . trials ) + 1 , * * self . _hyperopt_fmin_random_kwarg ( random ) ) chosen_params = chosen_params_container [ 0 ] return chosen_params
Suggest params to maximize an objective function based on the
        function evaluation history using a tree of Parzen estimators (TPE),
        as implemented in the hyperopt package.

        Use of this function requires that hyperopt be installed.
Suggest params to maximize an objective function based on the function evaluation history using a tree of Parzen estimators ( TPE ) as implemented in the hyperopt package .