Run.add_resource() - Code Metrics - Inspection of "Merge pull request #156 from d4nst/feature-155" - IDSIA/sacred - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 3e9443...e3cc93 )

by Klaus

created 2017-03-24 09:21 UTC

Run.add_resource() A

↳ Parent: Project

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	1
c	1
b	0
f	0
dl	0
loc	17
rs	9.4285

#!/usr/bin/env python
# coding=utf-8
from __future__ import division, print_function, unicode_literals

import datetime
import os.path
import sys
import threading
import traceback as tb

from tempfile import NamedTemporaryFile

from sacred.randomness import set_global_seed
from sacred.utils import (tee_output, ObserverError, SacredInterrupt,
                          join_paths, flush)


__sacred__ = True  # marks files that should be filtered from stack traces


class Run(object):
    """Represent and manage a single run of an experiment."""

    def __init__(self, config, config_modifications, main_function, observers,
                 root_logger, run_logger, experiment_info, host_info,
                 pre_run_hooks, post_run_hooks, captured_out_filter=None):

        self._id = None
        """The ID of this run as assigned by the first observer"""

        self.captured_out = None
        """Captured stdout and stderr"""

        self.config = config
        """The final configuration used for this run"""

        self.config_modifications = config_modifications
        """A ConfigSummary object with information about config changes"""

        self.experiment_info = experiment_info
        """A dictionary with information about the experiment"""

        self.host_info = host_info
        """A dictionary with information about the host"""

        self.info = {}
        """Custom info dict that will be sent to the observers"""

        self.root_logger = root_logger
        """The root logger that was used to create all the others"""

        self.run_logger = run_logger
        """The logger that is used for this run"""

        self.main_function = main_function
        """The main function that is executed with this run"""

        self.observers = observers
        """A list of all observers that observe this run"""

        self.pre_run_hooks = pre_run_hooks
        """List of pre-run hooks (captured functions called before this run)"""

        self.post_run_hooks = post_run_hooks
        """List of post-run hooks (captured functions called after this run)"""

        self.result = None
        """The return value of the main function"""

        self.status = None
        """The current status of the run, from QUEUED to COMPLETED"""

        self.start_time = None
        """The datetime when this run was started"""

        self.stop_time = None
        """The datetime when this run stopped"""

        self.debug = False
        """Determines whether this run is executed in debug mode"""

        self.pdb = False
        """If true the pdb debugger is automatically started after a failure"""

        self.meta_info = {}
        """A custom comment for this run"""

        self.beat_interval = 10.0  # sec
        """The time between two heartbeat events measured in seconds"""

        self.unobserved = False
        """Indicates whether this run should be unobserved"""

        self.force = False
        """Disable warnings about suspicious changes"""

        self.queue_only = False
        """If true then this run will only fire the queued_event and quit"""

        self.captured_out_filter = captured_out_filter
        """Filter function to be applied to captured output"""

        self.fail_trace = None
        """A stacktrace, in case the run failed"""

        self._heartbeat = None
        self._failed_observers = []
        self._output_file = None

    def open_resource(self, filename, mode='r'):
        """Open a file and also save it as a resource.

        Opens a file, reports it to the observers as a resource, and returns
        the opened file.

        In Sacred terminology a resource is a file that the experiment needed
        to access during a run. In case of a MongoObserver that means making
        sure the file is stored in the database (but avoiding duplicates) along
        its path and md5 sum.

        See also :py:meth:`sacred.Experiment.open_resource`.

        Parameters
        ----------
        filename : str
            name of the file that should be opened
        mode : str
            mode that file will be open

        Returns
        -------
        file
            the opened file-object
        """
        filename = os.path.abspath(filename)
        self._emit_resource_added(filename)  # TODO: maybe non-blocking?
        return open(filename, mode)

    def add_resource(self, filename):
        """Add a file as a resource.

        In Sacred terminology a resource is a file that the experiment needed
        to access during a run. In case of a MongoObserver that means making
        sure the file is stored in the database (but avoiding duplicates) along
        its path and md5 sum.

        See also :py:meth:`sacred.Experiment.add_resource`.

        Parameters
        ----------
        filename : str
            name of the file to be stored as a resource
        """
        filename = os.path.abspath(filename)
        self._emit_resource_added(filename)

    def add_artifact(self, filename, name=None):
        """Add a file as an artifact.

        In Sacred terminology an artifact is a file produced by the experiment
        run. In case of a MongoObserver that means storing the file in the
        database.

        See also :py:meth:`sacred.Experiment.add_artifact`.

        Parameters
        ----------
        filename : str
            name of the file to be stored as artifact
        name : str, optional
            optionally set the name of the artifact.
            Defaults to the relative file-path.
        """
        filename = os.path.abspath(filename)
        name = os.path.relpath(filename) if name is None else name
        self._emit_artifact_added(name, filename)

    def __call__(self, *args):
        r"""Start this run.

        Parameters
        ----------
        \*args
            parameters passed to the main function

        Returns
        -------
            the return value of the main function
        """
        if self.start_time is not None:
            raise RuntimeError('A run can only be started once. '
                               '(Last start was {})'.format(self.start_time))

        if self.unobserved:
            self.observers = []
        else:
            self.observers = sorted(self.observers, key=lambda x: -x.priority)

        self.warn_if_unobserved()
        set_global_seed(self.config['seed'])

        if self.queue_only:
            self._emit_queued()
            return
        try:
            try:
                with NamedTemporaryFile() as f, tee_output(f) as final_out:
                    self._output_file = f
                    self._emit_started()
                    self._start_heartbeat()
                    self._execute_pre_run_hooks()
                    self.result = self.main_function(*args)
                    self._execute_post_run_hooks()
                    if self.result is not None:
                        self.run_logger.info('Result: {}'.format(self.result))
                    elapsed_time = self._stop_time()
                    self.run_logger.info('Completed after %s', elapsed_time)
            finally:
                self.captured_out = final_out[0]
                if self.captured_out_filter is not None:
                    self.captured_out = self.captured_out_filter(
                        self.captured_out)
            self._stop_heartbeat()
            self._emit_completed(self.result)
        except (SacredInterrupt, KeyboardInterrupt) as e:
            self._stop_heartbeat()
            status = getattr(e, 'STATUS', 'INTERRUPTED')
            self._emit_interrupted(status)
            raise
        except:
            exc_type, exc_value, trace = sys.exc_info()
            self._stop_heartbeat()
            self._emit_failed(exc_type, exc_value, trace.tb_next)
            raise
        finally:
            self._warn_about_failed_observers()

        return self.result

    def _get_captured_output(self):
        if self._output_file.closed:
            return  # nothing we can do

        flush()
        self._output_file.flush()
        self._output_file.seek(0)
        text = self._output_file.read().decode()
        if self.captured_out_filter is not None:
            text = self.captured_out_filter(text)
        self.captured_out = text

    def _start_heartbeat(self):
        self._emit_heartbeat()
        if self.beat_interval > 0:
            self._heartbeat = threading.Timer(self.beat_interval,
                                              self._start_heartbeat)
            self._heartbeat.start()

    def _stop_heartbeat(self):
        if self._heartbeat is not None:
            self._heartbeat.cancel()
        self._heartbeat = None
        self._emit_heartbeat()  # one final beat to flush pending changes

    def _emit_queued(self):
        self.status = 'QUEUED'
        queue_time = datetime.datetime.utcnow()
        self.meta_info['queue_time'] = queue_time
        command = join_paths(self.main_function.prefix,
                             self.main_function.signature.name)

        self.run_logger.info("Queuing-up command '%s'", command)
        for observer in self.observers:
            if hasattr(observer, 'queued_event'):
                _id = observer.queued_event(
                    ex_info=self.experiment_info,
                    command=command,
                    queue_time=queue_time,
                    config=self.config,
                    meta_info=self.meta_info,
                    _id=self._id
                )
                if self._id is None:
                    self._id = _id
                # do not catch any exceptions on startup:
                # the experiment SHOULD fail if any of the observers fails

        if self._id is None:
            self.run_logger.info('Queued')
        else:
            self.run_logger.info('Queued-up run with ID "{}"'.format(self._id))

    def _emit_started(self):
        self.status = 'RUNNING'
        self.start_time = datetime.datetime.utcnow()
        command = join_paths(self.main_function.prefix,
                             self.main_function.signature.name)
        self.run_logger.info("Running command '%s'", command)
        for observer in self.observers:
            if hasattr(observer, 'started_event'):
                _id = observer.started_event(
                    ex_info=self.experiment_info,
                    command=command,
                    host_info=self.host_info,
                    start_time=self.start_time,
                    config=self.config,
                    meta_info=self.meta_info,
                    _id=self._id
                )
                if self._id is None:
                    self._id = _id
                # do not catch any exceptions on startup:
                # the experiment SHOULD fail if any of the observers fails
        if self._id is None:
            self.run_logger.info('Started')
        else:
            self.run_logger.info('Started run with ID "{}"'.format(self._id))

    def _emit_heartbeat(self):
        beat_time = datetime.datetime.utcnow()
        self._get_captured_output()
        for observer in self.observers:
            self._safe_call(observer, 'heartbeat_event',
                            info=self.info,
                            captured_out=self.captured_out,
                            beat_time=beat_time)

    def _stop_time(self):
        self.stop_time = datetime.datetime.utcnow()
        elapsed_time = datetime.timedelta(
            seconds=round((self.stop_time - self.start_time).total_seconds()))
        return elapsed_time

    def _emit_completed(self, result):
        self.status = 'COMPLETED'
        for observer in self.observers:
            self._final_call(observer, 'completed_event',
                             stop_time=self.stop_time,
                             result=result)

    def _emit_interrupted(self, status):
        self.status = status
        elapsed_time = self._stop_time()
        self.run_logger.warning("Aborted after %s!", elapsed_time)
        for observer in self.observers:
            self._final_call(observer, 'interrupted_event',
                             interrupt_time=self.stop_time,
                             status=status)

    def _emit_failed(self, exc_type, exc_value, trace):
        self.status = 'FAILED'
        elapsed_time = self._stop_time()
        self.run_logger.error("Failed after %s!", elapsed_time)
        self.fail_trace = tb.format_exception(exc_type, exc_value, trace)
        for observer in self.observers:
            self._final_call(observer, 'failed_event',
                             fail_time=self.stop_time,
                             fail_trace=self.fail_trace)

    def _emit_resource_added(self, filename):
        for observer in self.observers:
            self._safe_call(observer, 'resource_event', filename=filename)

    def _emit_artifact_added(self, name, filename):
        for observer in self.observers:
            self._safe_call(observer, 'artifact_event',
                            name=name,
                            filename=filename)

    def _safe_call(self, obs, method, **kwargs):
        if obs not in self._failed_observers and hasattr(obs, method):
            try:
                getattr(obs, method)(**kwargs)
            except ObserverError as e:
                self._failed_observers.append(obs)
                self.run_logger.warning("An error ocurred in the '{}' "
                                        "observer: {}".format(obs, e))
            except:
                self._failed_observers.append(obs)
                raise

    def _final_call(self, observer, method, **kwargs):
        if hasattr(observer, method):
            try:
                getattr(observer, method)(**kwargs)
            except Exception:
                # Feels dirty to catch all exceptions, but it is just for
                # finishing up, so we don't want one observer to kill the
                # others
                self.run_logger.error(tb.format_exc())

    def _warn_about_failed_observers(self):
        for observer in self._failed_observers:
            self.run_logger.warning("The observer '{}' failed at some point "
                                    "during the run.".format(observer))

    def _execute_pre_run_hooks(self):
        for pr in self.pre_run_hooks:
            pr()

    def _execute_post_run_hooks(self):
        for pr in self.post_run_hooks:
            pr()

    def warn_if_unobserved(self):
        if not self.observers and not self.debug and not self.unobserved:
            self.run_logger.warning("No observers have been added to this run")


1		#!/usr/bin/env python
2		# coding=utf-8
3		from __future__ import division, print_function, unicode_literals
4
5		import datetime
6		import os.path
7		import sys
8		import threading
9		import traceback as tb
10
11		from tempfile import NamedTemporaryFile
12
13		from sacred.randomness import set_global_seed
14		from sacred.utils import (tee_output, ObserverError, SacredInterrupt,
15		join_paths, flush)
16
17
18		__sacred__ = True # marks files that should be filtered from stack traces
19
20
21		class Run(object):
22		"""Represent and manage a single run of an experiment."""
23
24		def __init__(self, config, config_modifications, main_function, observers,
25		root_logger, run_logger, experiment_info, host_info,
26		pre_run_hooks, post_run_hooks, captured_out_filter=None):
27
28		self._id = None
29		"""The ID of this run as assigned by the first observer"""
30
31		self.captured_out = None
32		"""Captured stdout and stderr"""
33
34		self.config = config
35		"""The final configuration used for this run"""
36
37		self.config_modifications = config_modifications
38		"""A ConfigSummary object with information about config changes"""
39
40		self.experiment_info = experiment_info
41		"""A dictionary with information about the experiment"""
42
43		self.host_info = host_info
44		"""A dictionary with information about the host"""
45
46		self.info = {}
47		"""Custom info dict that will be sent to the observers"""
48
49		self.root_logger = root_logger
50		"""The root logger that was used to create all the others"""
51
52		self.run_logger = run_logger
53		"""The logger that is used for this run"""
54
55		self.main_function = main_function
56		"""The main function that is executed with this run"""
57
58		self.observers = observers
59		"""A list of all observers that observe this run"""
60
61		self.pre_run_hooks = pre_run_hooks
62		"""List of pre-run hooks (captured functions called before this run)"""
63
64		self.post_run_hooks = post_run_hooks
65		"""List of post-run hooks (captured functions called after this run)"""
66
67		self.result = None
68		"""The return value of the main function"""
69
70		self.status = None
71		"""The current status of the run, from QUEUED to COMPLETED"""
72
73		self.start_time = None
74		"""The datetime when this run was started"""
75
76		self.stop_time = None
77		"""The datetime when this run stopped"""
78
79		self.debug = False
80		"""Determines whether this run is executed in debug mode"""
81
82		self.pdb = False
83		"""If true the pdb debugger is automatically started after a failure"""
84
85		self.meta_info = {}
86		"""A custom comment for this run"""
87
88		self.beat_interval = 10.0 # sec
89		"""The time between two heartbeat events measured in seconds"""
90
91		self.unobserved = False
92		"""Indicates whether this run should be unobserved"""
93
94		self.force = False
95		"""Disable warnings about suspicious changes"""
96
97		self.queue_only = False
98		"""If true then this run will only fire the queued_event and quit"""
99
100		self.captured_out_filter = captured_out_filter
101		"""Filter function to be applied to captured output"""
102
103		self.fail_trace = None
104		"""A stacktrace, in case the run failed"""
105
106		self._heartbeat = None
107		self._failed_observers = []
108		self._output_file = None
109
110		def open_resource(self, filename, mode='r'):
111		"""Open a file and also save it as a resource.
112
113		Opens a file, reports it to the observers as a resource, and returns
114		the opened file.
115
116		In Sacred terminology a resource is a file that the experiment needed
117		to access during a run. In case of a MongoObserver that means making
118		sure the file is stored in the database (but avoiding duplicates) along
119		its path and md5 sum.
120
121		See also :py:meth:`sacred.Experiment.open_resource`.
122
123		Parameters
124		----------
125		filename : str
126		name of the file that should be opened
127		mode : str
128		mode that file will be open
129
130		Returns
131		-------
132		file
133		the opened file-object
134		"""
135		filename = os.path.abspath(filename)
136		self._emit_resource_added(filename) # TODO: maybe non-blocking?
137		return open(filename, mode)
138
139		def add_resource(self, filename):
140		"""Add a file as a resource.
141
142		In Sacred terminology a resource is a file that the experiment needed
143		to access during a run. In case of a MongoObserver that means making
144		sure the file is stored in the database (but avoiding duplicates) along
145		its path and md5 sum.
146
147		See also :py:meth:`sacred.Experiment.add_resource`.
148
149		Parameters
150		----------
151		filename : str
152		name of the file to be stored as a resource
153		"""
154		filename = os.path.abspath(filename)
155		self._emit_resource_added(filename)
156
157		def add_artifact(self, filename, name=None):
158		"""Add a file as an artifact.
159
160		In Sacred terminology an artifact is a file produced by the experiment
161		run. In case of a MongoObserver that means storing the file in the
162		database.
163
164		See also :py:meth:`sacred.Experiment.add_artifact`.
165
166		Parameters
167		----------
168		filename : str
169		name of the file to be stored as artifact
170		name : str, optional
171		optionally set the name of the artifact.
172		Defaults to the relative file-path.
173		"""
174		filename = os.path.abspath(filename)
175		name = os.path.relpath(filename) if name is None else name
176		self._emit_artifact_added(name, filename)
177
178		def __call__(self, *args):
179		r"""Start this run.
180
181		Parameters
182		----------
183		\*args
184		parameters passed to the main function
185
186		Returns
187		-------
188		the return value of the main function
189		"""
190		if self.start_time is not None:
191		raise RuntimeError('A run can only be started once. '
192		'(Last start was {})'.format(self.start_time))
193
194		if self.unobserved:
195		self.observers = []
196		else:
197		self.observers = sorted(self.observers, key=lambda x: -x.priority)
198
199		self.warn_if_unobserved()
200		set_global_seed(self.config['seed'])
201
202		if self.queue_only:
203		self._emit_queued()
204		return
205		try:
206		try:
207		with NamedTemporaryFile() as f, tee_output(f) as final_out:
208		self._output_file = f
209		self._emit_started()
210		self._start_heartbeat()
211		self._execute_pre_run_hooks()
212		self.result = self.main_function(*args)
213		self._execute_post_run_hooks()
214		if self.result is not None:
215		self.run_logger.info('Result: {}'.format(self.result))
216		elapsed_time = self._stop_time()
217		self.run_logger.info('Completed after %s', elapsed_time)
218		finally:
219		self.captured_out = final_out[0]
220		if self.captured_out_filter is not None:
221		self.captured_out = self.captured_out_filter(
222		self.captured_out)
223		self._stop_heartbeat()
224		self._emit_completed(self.result)
225		except (SacredInterrupt, KeyboardInterrupt) as e:
226		self._stop_heartbeat()
227		status = getattr(e, 'STATUS', 'INTERRUPTED')
228		self._emit_interrupted(status)
229		raise
230		except:
231		exc_type, exc_value, trace = sys.exc_info()
232		self._stop_heartbeat()
233		self._emit_failed(exc_type, exc_value, trace.tb_next)
234		raise
235		finally:
236		self._warn_about_failed_observers()
237
238		return self.result
239
240		def _get_captured_output(self):
241		if self._output_file.closed:
242	View Code Duplication	return # nothing we can do
		0 ignored issues – show Duplication introduced 2017-01-16 09:54 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
243		flush()
244		self._output_file.flush()
245		self._output_file.seek(0)
246		text = self._output_file.read().decode()
247		if self.captured_out_filter is not None:
248		text = self.captured_out_filter(text)
249		self.captured_out = text
250
251		def _start_heartbeat(self):
252		self._emit_heartbeat()
253		if self.beat_interval > 0:
254		self._heartbeat = threading.Timer(self.beat_interval,
255		self._start_heartbeat)
256		self._heartbeat.start()
257
258		def _stop_heartbeat(self):
259		if self._heartbeat is not None:
260		self._heartbeat.cancel()
261		self._heartbeat = None
262		self._emit_heartbeat() # one final beat to flush pending changes
263
264		def _emit_queued(self):
265		self.status = 'QUEUED'
266		queue_time = datetime.datetime.utcnow()
267		self.meta_info['queue_time'] = queue_time
268		command = join_paths(self.main_function.prefix,
269	View Code Duplication	self.main_function.signature.name)
		0 ignored issues – show Duplication introduced 2017-01-16 09:54 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
270		self.run_logger.info("Queuing-up command '%s'", command)
271		for observer in self.observers:
272		if hasattr(observer, 'queued_event'):
273		_id = observer.queued_event(
274		ex_info=self.experiment_info,
275		command=command,
276		queue_time=queue_time,
277		config=self.config,
278		meta_info=self.meta_info,
279		_id=self._id
280		)
281		if self._id is None:
282		self._id = _id
283		# do not catch any exceptions on startup:
284		# the experiment SHOULD fail if any of the observers fails
285
286		if self._id is None:
287		self.run_logger.info('Queued')
288		else:
289		self.run_logger.info('Queued-up run with ID "{}"'.format(self._id))
290
291		def _emit_started(self):
292		self.status = 'RUNNING'
293		self.start_time = datetime.datetime.utcnow()
294		command = join_paths(self.main_function.prefix,
295		self.main_function.signature.name)
296		self.run_logger.info("Running command '%s'", command)
297		for observer in self.observers:
298		if hasattr(observer, 'started_event'):
299		_id = observer.started_event(
300		ex_info=self.experiment_info,
301		command=command,
302		host_info=self.host_info,
303		start_time=self.start_time,
304		config=self.config,
305		meta_info=self.meta_info,
306		_id=self._id
307		)
308		if self._id is None:
309		self._id = _id
310		# do not catch any exceptions on startup:
311		# the experiment SHOULD fail if any of the observers fails
312		if self._id is None:
313		self.run_logger.info('Started')
314		else:
315		self.run_logger.info('Started run with ID "{}"'.format(self._id))
316
317		def _emit_heartbeat(self):
318		beat_time = datetime.datetime.utcnow()
319		self._get_captured_output()
320		for observer in self.observers:
321		self._safe_call(observer, 'heartbeat_event',
322		info=self.info,
323		captured_out=self.captured_out,
324		beat_time=beat_time)
325
326		def _stop_time(self):
327		self.stop_time = datetime.datetime.utcnow()
328		elapsed_time = datetime.timedelta(
329		seconds=round((self.stop_time - self.start_time).total_seconds()))
330		return elapsed_time
331
332		def _emit_completed(self, result):
333		self.status = 'COMPLETED'
334		for observer in self.observers:
335		self._final_call(observer, 'completed_event',
336		stop_time=self.stop_time,
337		result=result)
338
339		def _emit_interrupted(self, status):
340		self.status = status
341		elapsed_time = self._stop_time()
342		self.run_logger.warning("Aborted after %s!", elapsed_time)
343		for observer in self.observers:
344		self._final_call(observer, 'interrupted_event',
345		interrupt_time=self.stop_time,
346		status=status)
347
348		def _emit_failed(self, exc_type, exc_value, trace):
349		self.status = 'FAILED'
350		elapsed_time = self._stop_time()
351		self.run_logger.error("Failed after %s!", elapsed_time)
352		self.fail_trace = tb.format_exception(exc_type, exc_value, trace)
353		for observer in self.observers:
354		self._final_call(observer, 'failed_event',
355		fail_time=self.stop_time,
356		fail_trace=self.fail_trace)
357
358		def _emit_resource_added(self, filename):
359		for observer in self.observers:
360		self._safe_call(observer, 'resource_event', filename=filename)
361
362		def _emit_artifact_added(self, name, filename):
363		for observer in self.observers:
364		self._safe_call(observer, 'artifact_event',
365		name=name,
366		filename=filename)
367
368		def _safe_call(self, obs, method, **kwargs):
369		if obs not in self._failed_observers and hasattr(obs, method):
370		try:
371		getattr(obs, method)(**kwargs)
372		except ObserverError as e:
373		self._failed_observers.append(obs)
374		self.run_logger.warning("An error ocurred in the '{}' "
375		"observer: {}".format(obs, e))
376		except:
377		self._failed_observers.append(obs)
378		raise
379
380		def _final_call(self, observer, method, **kwargs):
381		if hasattr(observer, method):
382		try:
383		getattr(observer, method)(**kwargs)
384		except Exception:
385		# Feels dirty to catch all exceptions, but it is just for
386		# finishing up, so we don't want one observer to kill the
387		# others
388		self.run_logger.error(tb.format_exc())
389
390		def _warn_about_failed_observers(self):
391		for observer in self._failed_observers:
392		self.run_logger.warning("The observer '{}' failed at some point "
393		"during the run.".format(observer))
394
395		def _execute_pre_run_hooks(self):
396		for pr in self.pre_run_hooks:
397		pr()
398
399		def _execute_post_run_hooks(self):
400		for pr in self.post_run_hooks:
401		pr()
402
403		def warn_if_unobserved(self):
404		if not self.observers and not self.debug and not self.unobserved:
405		self.run_logger.warning("No observers have been added to this run")
406

IDSIA / sacred

Push — master ( 3e9443...e3cc93 )

Run.add_resource() A

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