75 lines
2.6 KiB
Python
75 lines
2.6 KiB
Python
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from functools import partial
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from . import functions
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from . import rpc_async
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import torch
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from .constants import UNSET_RPC_TIMEOUT
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from torch.futures import Future
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def _local_invoke(rref, func_name, args, kwargs):
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return getattr(rref.local_value(), func_name)(*args, **kwargs)
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@functions.async_execution
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def _local_invoke_async_execution(rref, func_name, args, kwargs):
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return getattr(rref.local_value(), func_name)(*args, **kwargs)
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def _invoke_rpc(rref, rpc_api, func_name, timeout, *args, **kwargs):
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def _rref_type_cont(rref_fut):
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rref_type = rref_fut.value()
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_invoke_func = _local_invoke
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# Bypass ScriptModules when checking for async function attribute.
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bypass_type = issubclass(rref_type, torch.jit.ScriptModule) or issubclass(
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rref_type, torch._C.ScriptModule
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)
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if not bypass_type:
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func = getattr(rref_type, func_name)
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if hasattr(func, "_wrapped_async_rpc_function"):
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_invoke_func = _local_invoke_async_execution
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return rpc_api(
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rref.owner(),
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_invoke_func,
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args=(rref, func_name, args, kwargs),
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timeout=timeout
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)
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rref_fut = rref._get_type(timeout=timeout, blocking=False)
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if rpc_api != rpc_async:
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rref_fut.wait()
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return _rref_type_cont(rref_fut)
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else:
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# A little explanation on this.
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# rpc_async returns a Future pointing to the return value of `func_name`, it returns a `Future[T]`
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# Calling _rref_type_cont from the `then` lambda causes Future wrapping. IOW, `then` returns a `Future[Future[T]]`
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# To address that, we return a Future that is completed with the result of the async call.
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result: Future = Future()
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def _wrap_rref_type_cont(fut):
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try:
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_rref_type_cont(fut).then(_complete_op)
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except BaseException as ex:
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result.set_exception(ex)
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def _complete_op(fut):
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try:
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result.set_result(fut.value())
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except BaseException as ex:
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result.set_exception(ex)
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rref_fut.then(_wrap_rref_type_cont)
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return result
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# This class manages proxied RPC API calls for RRefs. It is entirely used from
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# C++ (see python_rpc_handler.cpp).
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class RRefProxy:
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def __init__(self, rref, rpc_api, timeout=UNSET_RPC_TIMEOUT):
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self.rref = rref
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self.rpc_api = rpc_api
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self.rpc_timeout = timeout
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def __getattr__(self, func_name):
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return partial(_invoke_rpc, self.rref, self.rpc_api, func_name, self.rpc_timeout)
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