[Cherry-picked 2.0.1] Fix virtual function issue with CTC decoder #3230
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Currently, creating CTCDecoder object by passing a language model to `lm` argument without assigning it to a variable elsewhere causes `RuntimeError: Tried to call pure virtual function "LM::start"`. According to discussions on PyBind11, ( pybind/pybind11#4013 and pybind/pybind11#2839 ) this is due to Python object garbage-collected by the time it's used by code implemented in C++. It attempts to call methods defined in Python, which overrides the base pure virtual function, but the object which provides this override gets deleted by garbage collrector, as the original object is not reference counted. This commit fixes this by simply assiging the given `lm` object as an attribute of CTCDecoder class. Address #3218
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hwangjeff
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Summary: Currently, creating CTCDecoder object by passing a language model to `lm` argument without assigning it to a variable elsewhere causes `RuntimeError: Tried to call pure virtual function "LM::start"`. According to discussions on PyBind11, ( pybind/pybind11#4013 and pybind/pybind11#2839 ) this is due to Python object garbage-collected by the time it's used by code implemented in C++. It attempts to call methods defined in Python, which overrides the base pure virtual function, but the object which provides this override gets deleted by garbage collrector, as the original object is not reference counted. This commit fixes this by simply assiging the given `lm` object as an attribute of CTCDecoder class. Address #3218 Pull Request resolved: #3230 Reviewed By: hwangjeff Differential Revision: D44642989 Pulled By: mthrok fbshipit-source-id: a90af828c7c576bc0eb505164327365ebaadc471
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) Summary: Currently, creating CTCDecoder object by passing a language model to `lm` argument without assigning it to a variable elsewhere causes `RuntimeError: Tried to call pure virtual function "LM::start"`. According to discussions on PyBind11, ( pybind/pybind11#4013 and pybind/pybind11#2839 ) this is due to Python object garbage-collected by the time it's used by code implemented in C++. It attempts to call methods defined in Python, which overrides the base pure virtual function, but the object which provides this override gets deleted by garbage collrector, as the original object is not reference counted. This commit fixes this by simply assiging the given `lm` object as an attribute of CTCDecoder class. Address #3218 Pull Request resolved: #3230 Reviewed By: hwangjeff Differential Revision: D44642989 Pulled By: mthrok fbshipit-source-id: a90af828c7c576bc0eb505164327365ebaadc471
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Currently, creating CTCDecoder object by passing a language model to
lmargument without assigning it to a variable elsewhere causesRuntimeError: Tried to call pure virtual function "LM::start".According to discussions on PyBind11, (
pybind/pybind11#4013 and
pybind/pybind11#2839
) this is due to Python object garbage-collected by the time
it's used by code implemented in C++. It attempts to call
methods defined in Python, which overrides the base pure virtual
function, but the object which provides this override gets
deleted by garbage collrector, as the original object is not
reference counted.
This commit fixes this by simply assiging the given
lmobjectas an attribute of CTCDecoder class.
Address #3218