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import time
import types
from torch.utils.data import communication, MapDataPipe
DEFAULT_NON_BLOCKING_SLEEP = 0.001
__all__ = [
"DataPipeBehindQueues",
"EnsureNonBlockingMapDataPipe",
"NonBlockingMap",
"NotAvailable",
"QueueWrapperForMap",
"default_not_available_hook",
]
def default_not_available_hook():
time.sleep(DEFAULT_NON_BLOCKING_SLEEP)
class NotAvailable(Exception):
pass
class NonBlockingMap(MapDataPipe):
not_available_hook = default_not_available_hook
def __getitem__(self, index):
while True:
try:
return self.nonblocking_getitem(index)
except NotAvailable:
if NonBlockingMap.not_available_hook is not None:
NonBlockingMap.not_available_hook()
def __len__(self):
try:
return self.nonblocking_len()
except NotAvailable:
if NonBlockingMap.not_available_hook is not None:
NonBlockingMap.not_available_hook()
def nonblocking_len(self):
raise NotImplementedError(
"nonblocking_len is not implemented for %s" % self.__class__)
def nonblocking_getitem(self, index):
raise NotImplementedError(
"nonblocking_getitem is not implemented for %s" % self.__class__)
@staticmethod
def register_not_available_hook(hook_function):
NonBlockingMap.not_available_hook = hook_function
def EnsureNonBlockingMapDataPipe(validated_datapipe):
if not isinstance(validated_datapipe, MapDataPipe):
raise Exception(f'Not Map DataPipe - got {validated_datapipe.__class__}')
if isinstance(validated_datapipe, NonBlockingMap):
return validated_datapipe
if not hasattr(validated_datapipe, 'nonblocking_len'):
def nonblocking_len(self):
return self.__len__()
validated_datapipe.nonblocking_len = types.MethodType( # type: ignore[attr-defined]
nonblocking_len, validated_datapipe)
if not hasattr(validated_datapipe, 'nonblocking_getitem'):
def nonblocking_getitem(self, index):
return self.__getitem__(index)
validated_datapipe.nonblocking_getitem = types.MethodType( # type: ignore[attr-defined]
nonblocking_getitem, 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.MapDataPipeQueueProtocolServer):
raise Exception('Expecting MapDataPipeQueueProtocolServer, got', protocol)
source_datapipe = EnsureNonBlockingMapDataPipe(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.TerminateRequest):
forever = False
protocol.response_terminate()
elif isinstance(request, communication.messages.LenRequest):
size = source_datapipe.nonblocking_len()
protocol.response_len(size)
elif isinstance(request, communication.messages.GetItemRequest):
while forever:
try:
value = source_datapipe.nonblocking_getitem(request.key)
except NotAvailable:
yield True
continue
except IndexError as e:
# Alternatively, we can just allow the underlying DataPipe to throw an exception?
protocol.response_index_out_of_bound()
if full_stop:
forever = False
else:
yield True
break
protocol.response_item(request.key, value)
yield True # Returns control
break
else:
raise Exception('Unrecognized type of request received', request)
class QueueWrapperForMap(NonBlockingMap):
"""
Creates map.DataPipe which reads data from the DataLoader.Queue
"""
def __init__(self, protocol, response_wait_time=0.00001):
if not isinstance(protocol, communication.protocol.MapDataPipeQueueProtocolClient):
raise Exception('Got', protocol)
self.protocol = protocol
self.counter = 0
self._stop_iteration = False
self._response_wait_time = response_wait_time
def nonblocking_getitem(self, index):
if self._stop_iteration:
raise Exception(
'`getitem` or `nonblocking_getitem` called after receiving StopIteration')
if self.protocol.can_take_request():
self.protocol.request_item(index)
try:
response = self.protocol.get_response_item(block=True, timeout=self._response_wait_time)
except communication.protocol.EmptyQueue:
raise NotAvailable
if isinstance(response, communication.messages.StopIterationResponse):
self._stop_iteration = True
raise IndexError(f"Index {index} is out of bound.")
return response.key, response.value
def nonblocking_len(self):
if self._stop_iteration:
raise Exception(
'`len` or `nonblocking_len` called after receiving StopIteration')
if self.protocol.can_take_request():
self.protocol.request_len()
try:
response = self.protocol.get_response_len(block=True, timeout=self._response_wait_time)
except communication.protocol.EmptyQueue:
raise NotAvailable
return response.len
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