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* Resolve conflicting name, ContextManager Concept name `Context Manager` is taken by Python. See https://docs.python.org/3.6/reference/datamodel.html#with-statement-context-managers It says, A context manager is an object that defines the runtime context to be established when executing a with statement. The context manager handles the entry into, and the exit from, the desired runtime context for the execution of the block of code. The `ContextManager` here is more like a registry. And there is a C++ registry in caffe2 codebase `caffe2/caffe2/core/registry.h`. There is also a Caffe2DBRegistry, declared by calling `CAFFE_DECLARE_REGISTRY(Caffe2DBRegistry, DB, const string&, Mode);` in `caffe2/caffe2/core/db.h`. I think we can follow the concept name `Registry`, calling it `ContextRegistry`. * Make Classes and Functions internal to this module start with "_" Make Classes and Functions internal to this module start with "_" * Update context.py * Update context.py
124 lines
3.3 KiB
Python
124 lines
3.3 KiB
Python
## @package context
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# Module caffe2.python.context
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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import threading
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import six
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class _ContextInfo(object):
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def __init__(self, cls, allow_default, arg_name):
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self.cls = cls
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self.allow_default = allow_default
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self.arg_name = arg_name
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self._local_stack = threading.local()
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@property
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def _stack(self):
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if not hasattr(self._local_stack, 'obj'):
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self._local_stack.obj = []
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return self._local_stack.obj
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def enter(self, value):
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self._stack.append(value)
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def exit(self, value):
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assert len(self._stack) > 0, 'Context %s is empty.' % self.cls
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assert self._stack.pop() == value
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def get_active(self, required=True):
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if len(self._stack) == 0:
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if not required:
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return None
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assert self.allow_default, (
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'Context %s is required but none is active.' % self.cls)
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self.enter(self.cls())
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return self._stack[-1]
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class _ContextRegistry(object):
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def __init__(self):
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self._ctxs = {}
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def register(self, ctx_info):
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assert isinstance(ctx_info, _ContextInfo)
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assert (ctx_info.cls not in self._ctxs), (
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'Context %s already registered' % ctx_info.cls)
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self._ctxs[ctx_info.cls] = ctx_info
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def get(self, cls):
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assert cls in self._ctxs, 'Context %s not registered.' % cls
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return self._ctxs[cls]
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_CONTEXT_REGISTRY = _ContextRegistry()
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def _context_registry():
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global _CONTEXT_REGISTRY
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return _CONTEXT_REGISTRY
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def __enter__(self):
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if self._prev_enter is not None:
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self._prev_enter()
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_context_registry().get(self._ctx_class).enter(self)
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return self
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def __exit__(self, *args):
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_context_registry().get(self._ctx_class).exit(self)
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if self._prev_exit is not None:
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self._prev_exit(*args)
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def __call__(self, func):
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@six.wraps(func)
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def wrapper(*args, **kwargs):
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with self:
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return func(*args, **kwargs)
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return wrapper
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@classmethod
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def _current(cls, value=None, required=True):
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return _get_active_context(cls, value, required)
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class define_context(object):
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def __init__(self, arg_name=None, allow_default=False):
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self.arg_name = arg_name
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self.allow_default = allow_default
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def __call__(self, cls):
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assert not hasattr(cls, '_ctx_class'), (
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'%s parent class (%s) already defines context.' % (
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cls, cls._ctx_class))
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cls._ctx_class = cls
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_context_registry().register(
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_ContextInfo(cls, self.allow_default, self.arg_name)
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)
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cls._prev_enter = cls.__enter__ if hasattr(cls, '__enter__') else None
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cls._prev_exit = cls.__exit__ if hasattr(cls, '__exit__') else None
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cls.__enter__ = __enter__
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cls.__exit__ = __exit__
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cls.__call__ = __call__
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cls.current = _current
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return cls
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def _get_active_context(cls, val=None, required=True):
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ctx_info = _context_registry().get(cls)
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if val is not None:
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assert isinstance(val, cls), (
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'Wrong context type. Expected: %s, got %s.' % (cls, type(val)))
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return val
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return ctx_info.get_active(required=required)
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