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69 lines
3.4 KiB
Plaintext
69 lines
3.4 KiB
Plaintext
//- 💫 DOCS > USAGE > SPACY 101 > SERIALIZATION
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p
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| If you've been modifying the pipeline, vocabulary vectors and entities, or made
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| updates to the model, you'll eventually want
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| to #[strong save your progress] – for example, everything that's in your #[code nlp]
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| object. This means you'll have to translate its contents and structure
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| into a format that can be saved, like a file or a byte string. This
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| process is called serialization. spaCy comes with
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| #[strong built-in serialization methods] and supports the
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| #[+a("http://www.diveintopython3.net/serializing.html#dump") Pickle protocol].
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+aside("What's pickle?")
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| Pickle is Python's built-in object persistance system. It lets you
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| transfer arbitrary Python objects between processes. This is usually used
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| to load an object to and from disk, but it's also used for distributed
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| computing, e.g. with
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| #[+a("https://spark.apache.org/docs/0.9.0/python-programming-guide.html") PySpark]
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| or #[+a("http://dask.pydata.org/en/latest/") Dask]. When you unpickle an
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| object, you're agreeing to execute whatever code it contains. It's like
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| calling #[code eval()] on a string – so don't unpickle objects from
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| untrusted sources.
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p
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| All container classes, i.e. #[+api("language") #[code Language]],
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| #[+api("doc") #[code Doc]], #[+api("vocab") #[code Vocab]] and
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| #[+api("stringstore") #[code StringStore]] have the following methods
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| available:
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+table(["Method", "Returns", "Example"])
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- style = [1, 0, 1]
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+annotation-row(["to_bytes", "bytes", "nlp.to_bytes()"], style)
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+annotation-row(["from_bytes", "object", "nlp.from_bytes(bytes)"], style)
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+annotation-row(["to_disk", "-", "nlp.to_disk('/path')"], style)
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+annotation-row(["from_disk", "object", "nlp.from_disk('/path')"], style)
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p
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| For example, if you've processed a very large document, you can use
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| #[+api("doc#to_disk") #[code Doc.to_disk]] to save it to a file on your
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| local machine. This will save the document and its tokens, as well as
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| the vocabulary associated with the #[code Doc].
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+aside("Why saving the vocab?")
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| Saving the vocabulary with the #[code Doc] is important, because the
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| #[code Vocab] holds the context-independent information about the words,
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| tags and labels, and their #[strong hash values]. If the #[code Vocab]
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| wasn't saved with the #[code Doc], spaCy wouldn't know how to resolve
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| those IDs – for example, the word text or the dependency labels. You
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| might be saving #[code 446] for "whale", but in a different vocabulary,
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| this ID could map to "VERB". Similarly, if your document was processed by
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| a German model, its vocab will include the specific
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| #[+a("/docs/api/annotation#dependency-parsing-german") German dependency labels].
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+code.
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moby_dick = open('moby_dick.txt', 'r') # open a large document
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doc = nlp(moby_dick) # process it
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doc.to_disk('/moby_dick.bin') # save the processed Doc
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p
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| If you need it again later, you can load it back into an empty #[code Doc]
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| with an empty #[code Vocab] by calling
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| #[+api("doc#from_disk") #[code from_disk()]]:
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+code.
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from spacy.tokens import Doc # to create empty Doc
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from spacy.vocab import Vocab # to create empty Vocab
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doc = Doc(Vocab()).from_disk('/moby_dick.bin') # load processed Doc
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