Bases: BaseWorker
, ClassificationMixin
, ElementMixin
, TranscriptionMixin
, WorkerVersionMixin
, EntityMixin
, MetaDataMixin
Base class for ML workers that operate on Arkindex elements.
This class inherits from numerous mixin classes found in other modules of
arkindex.worker
, which provide helpers to read and write to the Arkindex API.
Parameters:
Name |
Type |
Description |
Default |
description |
str
|
The worker’s description |
'Arkindex Elements Worker'
|
support_cache |
bool
|
Whether the worker supports cache |
False
|
Source code in arkindex_worker/worker/__init__.py
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99 | def __init__(
self, description: str = "Arkindex Elements Worker", support_cache: bool = False
):
"""
:param description: The worker's description
:param support_cache: Whether the worker supports cache
"""
super().__init__(description, support_cache)
# Add mandatory argument to process elements
self.parser.add_argument(
"--elements-list",
help="JSON elements list to use",
type=open,
default=os.environ.get("TASK_ELEMENTS"),
)
self.parser.add_argument(
"--element",
type=uuid.UUID,
nargs="+",
help="One or more Arkindex element ID",
)
self.classes = {}
self.entity_types = {}
"""Known and available entity types in processed corpus
"""
self._worker_version_cache = {}
|
Attributes
entity_types
instance-attribute
Known and available entity types in processed corpus
store_activity
property
Whether or not WorkerActivity support has been enabled on the DataImport
used to run this worker.
Functions
list_elements
List the elements to be processed, either from the CLI arguments or
the cache database when enabled.
Returns:
Source code in arkindex_worker/worker/__init__.py
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131 | def list_elements(self) -> Union[Iterable[CachedElement], List[str]]:
"""
List the elements to be processed, either from the CLI arguments or
the cache database when enabled.
:return: An iterable of [CachedElement][arkindex_worker.cache.CachedElement] when cache support is enabled,
and a list of strings representing element IDs otherwise.
"""
assert not (
self.args.elements_list and self.args.element
), "elements-list and element CLI args shouldn't be both set"
out = []
# Load from the cache when available
# Flake8 wants us to use 'is True', but Peewee only supports '== True'
cache_query = CachedElement.select().where(
CachedElement.initial == True # noqa: E712
)
if self.use_cache and cache_query.exists():
return cache_query
# Process elements from JSON file
elif self.args.elements_list:
data = json.load(self.args.elements_list)
assert isinstance(data, list), "Elements list must be a list"
assert len(data), "No elements in elements list"
out += list(filter(None, [element.get("id") for element in data]))
# Add any extra element from CLI
elif self.args.element:
out += self.args.element
return out
|
Setup the worker using CLI arguments and environment variables.
Source code in arkindex_worker/worker/__init__.py
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162 | def configure(self):
"""
Setup the worker using CLI arguments and environment variables.
"""
# CLI args are stored on the instance so that implementations can access them
self.args = self.parser.parse_args()
if self.is_read_only:
super().configure_for_developers()
else:
super().configure()
super().configure_cache()
# Add report concerning elements
self.report = Reporter(
**self.worker_details, version=getattr(self, "worker_version_id", None)
)
|
run
Implements an Arkindex worker that goes through each element returned by
list_elements. It calls process_element, catching exceptions
and reporting them using the Reporter, and handles saving the report
once the process is complete as well as WorkerActivity updates when enabled.
Source code in arkindex_worker/worker/__init__.py
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247 | def run(self):
"""
Implements an Arkindex worker that goes through each element returned by
[list_elements][arkindex_worker.worker.ElementsWorker.list_elements]. It calls [process_element][arkindex_worker.worker.ElementsWorker.process_element], catching exceptions
and reporting them using the [Reporter][arkindex_worker.reporting.Reporter], and handles saving the report
once the process is complete as well as WorkerActivity updates when enabled.
"""
self.configure()
# List all elements either from JSON file
# or direct list of elements on CLI
elements = self.list_elements()
if not elements:
logger.warning("No elements to process, stopping.")
sys.exit(1)
if not self.store_activity:
logger.info(
"No worker activity will be stored as it is disabled for this process"
)
# Process every element
count = len(elements)
failed = 0
for i, item in enumerate(elements, start=1):
element = None
try:
if self.use_cache:
# Just use the result of list_elements as the element
element = item
else:
# Load element using the Arkindex API
element = Element(**self.request("RetrieveElement", id=item))
logger.info(f"Processing {element} ({i}/{count})")
# Process the element and report its progress if activities are enabled
if self.update_activity(element.id, ActivityState.Started):
self.process_element(element)
self.update_activity(element.id, ActivityState.Processed)
else:
logger.info(
f"Skipping element {element.id} as it was already processed"
)
continue
except Exception as e:
# Handle errors occurring while retrieving, processing or patching the activity for this element.
# Count the element as failed in case the activity update to "started" failed with no conflict.
# This prevent from processing the element
failed += 1
# Handle the case where we failed retrieving the element
element_id = element.id if element else item
if isinstance(e, ErrorResponse):
message = f"An API error occurred while processing element {element_id}: {e.title} - {e.content}"
else:
message = (
f"Failed running worker on element {element_id}: {repr(e)}"
)
logger.warning(
message,
exc_info=e if self.args.verbose else None,
)
if element:
# Try to update the activity to error state regardless of the response
try:
self.update_activity(element.id, ActivityState.Error)
except Exception:
pass
self.report.error(element_id, e)
# Save report as local artifact
self.report.save(self.work_dir / "ml_report.json")
if failed:
logger.error(
"Ran on {} elements: {} completed, {} failed".format(
count, count - failed, failed
)
)
if failed >= count: # Everything failed!
sys.exit(1)
|
process_element
Override this method to implement your worker and process a single Arkindex element at once.
Parameters:
Name |
Type |
Description |
Default |
element |
Union[Element, CachedElement]
|
The element to process. Will be a CachedElement instance if cache support is enabled, and an Element instance otherwise. |
required
|
Source code in arkindex_worker/worker/__init__.py
249
250
251
252
253
254
255
256 | def process_element(self, element: Union[Element, CachedElement]):
"""
Override this method to implement your worker and process a single Arkindex element at once.
:param element: The element to process.
Will be a CachedElement instance if cache support is enabled,
and an Element instance otherwise.
"""
|
update_activity
update_activity(element_id, state)
Update the WorkerActivity for this element and worker.
Parameters:
Name |
Type |
Description |
Default |
element_id |
Union[str, uuid.UUID]
|
ID of the element. |
required
|
state |
ActivityState
|
New WorkerActivity state for this element. |
required
|
Returns:
Type |
Description |
bool
|
True if the update has been successful or WorkerActivity support is disabled. False if the update has failed due to a conflict; this worker might have already processed this element. |
Source code in arkindex_worker/worker/__init__.py
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313 | def update_activity(
self, element_id: Union[str, uuid.UUID], state: ActivityState
) -> bool:
"""
Update the WorkerActivity for this element and worker.
:param element_id: ID of the element.
:param state: New WorkerActivity state for this element.
:returns: True if the update has been successful or WorkerActivity support is disabled.
False if the update has failed due to a conflict; this worker might have already processed
this element.
"""
if not self.store_activity:
logger.debug(
"Activity is not stored as the feature is disabled on this process"
)
return True
assert element_id and isinstance(
element_id, (uuid.UUID, str)
), "element_id shouldn't be null and should be an UUID or str"
assert isinstance(state, ActivityState), "state should be an ActivityState"
if self.is_read_only:
logger.warning("Cannot update activity as this worker is in read-only mode")
return True
try:
self.request(
"UpdateWorkerActivity",
id=self.worker_version_id,
body={
"element_id": str(element_id),
"process_id": self.process_information["id"],
"state": state.value,
},
)
except ErrorResponse as e:
if state == ActivityState.Started and e.status_code == 409:
# 409 conflict error when updating the state of an activity to "started" mean that we
# cannot process this element. We assume that the reason is that the state transition
# was forbidden i.e. that the activity was already in a started or processed state.
# This allow concurrent access to an element activity between multiple processes.
# Element should not be counted as failed as it is probably handled somewhere else.
logger.debug(
f"Cannot start processing element {element_id} due to a conflict. "
f"Another process could have processed it with the same version already."
)
return False
logger.warning(
f"Failed to update activity of element {element_id} to {state.value} due to an API error: {e.content}"
)
raise e
logger.debug(f"Updated activity of element {element_id} to {state}")
return True
|