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import time
import types
from torch.utils.data import IterDataPipe, communication
DEFAULT_NON_BLOCKING_SLEEP = 0.001
__all__ = [
"DataPipeBehindQueues",
"EnsureNonBlockingDataPipe",
"InvalidStateResetRequired",
"NonBlocking",
"NotAvailable",
"QueueWrapper",
"default_not_available_hook",
]
def default_not_available_hook():
time.sleep(DEFAULT_NON_BLOCKING_SLEEP)
class NotAvailable(Exception):
pass
class InvalidStateResetRequired(Exception):
"""
Returned by DataPipe when it is expecting to get reset request,
for example RouterDataPipe expecting all workers to request reset'
"""
pass
class NonBlocking(IterDataPipe):
not_available_hook = default_not_available_hook
def __iter__(self):
self.reset_iterator()
return self
def __next__(self):
while True:
try:
return self.nonblocking_next()
except StopIteration:
raise StopIteration
except NotAvailable:
if NonBlocking.not_available_hook is not None:
NonBlocking.not_available_hook()
def nonblocking_next(self):
raise NotImplementedError(
"nonblocking_next is not implemented for %s" % self.__class__)
def reset_iterator(self):
raise NotImplementedError(
"reset_iterator is not implemented for %s" % self.__class__)
@staticmethod
def register_not_available_hook(hook_function):
NonBlocking.not_available_hook = hook_function
def EnsureNonBlockingDataPipe(validated_datapipe):
if not isinstance(validated_datapipe, IterDataPipe):
raise Exception('Not Iterable DataPipe ' +
str(validated_datapipe.__class__))
if isinstance(validated_datapipe, NonBlocking):
return validated_datapipe
if not hasattr(validated_datapipe, '_as_iterator'):
validated_datapipe._as_iterator = None # type: ignore[attr-defined]
if not hasattr(validated_datapipe, 'nonblocking_next'):
def nonblocking_next(self):
if self._as_iterator is None:
self._as_iterator = iter(self)
return next(self._as_iterator)
validated_datapipe.nonblocking_next = types.MethodType( # type: ignore[attr-defined]
nonblocking_next, validated_datapipe)
if not hasattr(validated_datapipe, 'reset_iterator'):
def reset_iterator(self):
self._as_iterator = None
validated_datapipe.reset_iterator = types.MethodType( # type: ignore[attr-defined]
reset_iterator, validated_datapipe)
return validated_datapipe
def DataPipeBehindQueues(source_datapipe, protocol, full_stop=False, blocking_request_get=False):
"""
Indefinitely iterates over req_queue and passing values from source_datapipe to res_queue
If raise_stop is true, raises exception when StopIteration received from the source_datapipe
"""
if not isinstance(protocol, communication.protocol.IterDataPipeQueueProtocolServer):
raise Exception('Expecting IterDataPipeQueueProtocolServer, got', protocol)
source_datapipe = EnsureNonBlockingDataPipe(source_datapipe)
forever = True
while forever:
try:
# Non-blocking call is Extremely slow here for python.mp, need to figure out a good workaround
request = protocol.get_new_request(block=blocking_request_get)
except communication.protocol.EmptyQueue:
yield True
continue
if isinstance(request, communication.messages.ResetIteratorRequest):
source_datapipe.reset_iterator()
protocol.response_reset_iterator()
elif isinstance(request, communication.messages.TerminateRequest):
forever = False
protocol.response_terminate()
elif isinstance(request, communication.messages.GetNextRequest):
while forever:
try:
value = source_datapipe.nonblocking_next()
except NotAvailable:
yield True
continue
except StopIteration:
protocol.response_stop_iteration()
if full_stop:
forever = False
else:
yield True
break
except InvalidStateResetRequired:
protocol.response_invalid_state()
if full_stop:
forever = False
else:
yield True
break
protocol.response_next(value)
yield True # Returns control
break
else:
raise Exception('Unrecognized type of request received', request)
class QueueWrapper(NonBlocking):
"""
Creates iter.DataPipe which reads data from the DataLoader.Queue
"""
def __init__(self, protocol, response_wait_time=0.00001):
if not isinstance(protocol, communication.protocol.IterDataPipeQueueProtocolClient):
raise Exception('Got', protocol)
self.protocol = protocol
self.counter = 0
self._stop_iteration = False
self._response_wait_time = response_wait_time
def reset_iterator(self):
self._stop_iteration = False
self.counter = 0
self.protocol.request_reset_iterator()
while True:
try:
self.protocol.get_response_reset_iterator()
break
except communication.protocol.EmptyQueue:
if NonBlocking.not_available_hook is not None:
NonBlocking.not_available_hook()
def nonblocking_next(self):
if self._stop_iteration:
raise Exception(
'`next` or `nonblocking_next` called after receiving StopIteration')
if self.protocol.can_take_request():
self.protocol.request_next()
try:
response = self.protocol.get_response_next(block=True, timeout=self._response_wait_time)
except communication.protocol.EmptyQueue:
raise NotAvailable
if isinstance(response, communication.messages.StopIterationResponse):
self._stop_iteration = True
raise StopIteration
if isinstance(response, communication.messages.InvalidStateResponse):
raise NotAvailable
return response.value
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