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63 lines
2.6 KiB
Plaintext
63 lines
2.6 KiB
Plaintext
//- 💫 DOCS > USAGE > TRAINING > TEXT CLASSIFICATION
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+h(3, "example-textcat") Adding a text classifier to a spaCy model
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+tag-new(2)
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p
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| This example shows how to train a multi-label convolutional neural
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| network text classifier on IMDB movie reviews, using spaCy's new
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| #[+api("textcategorizer") #[code TextCategorizer]] component. The
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| dataset will be loaded automatically via Thinc's built-in dataset
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| loader. Predictions are available via
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| #[+api("doc#attributes") #[code Doc.cats]].
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+github("spacy", "examples/training/train_textcat.py", 500)
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+h(4) Step by step guide
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+list("numbers")
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+item
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| #[strong Load the model] you want to start with, or create an
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| #[strong empty model] using
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| #[+api("spacy#blank") #[code spacy.blank]] with the ID of your
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| language. If you're using an existing model, make sure to disable all
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| other pipeline components during training using
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| #[+api("language#disable_pipes") #[code nlp.disable_pipes]]. This
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| way, you'll only be training the text classifier.
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+item
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| #[strong Add the text classifier] to the pipeline, and add the labels
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| you want to train – for example, #[code POSITIVE].
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+item
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| #[strong Load and pre-process the dataset], shuffle the data and
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| split off a part of it to hold back for evaluation. This way, you'll
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| be able to see results on each training iteration.
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+item
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| #[strong Loop over] the training examples, partition them into
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| batches and create #[code Doc] and #[code GoldParse] objects for each
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| example in the batch.
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+item
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| #[strong Update the model] by calling
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| #[+api("language#update") #[code nlp.update]], which steps
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| through the examples and makes a #[strong prediction]. It then
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| consults the annotations provided on the #[code GoldParse] instance,
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| to see whether it was right. If it was wrong, it adjusts its weights
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| so that the correct prediction will score higher next time.
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+item
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| Optionally, you can also #[strong evaluate the text classifier] on
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| each iteration, by checking how it performs on the development data
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| held back from the dataset. This lets you print the
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| #[strong precision], #[strong recall] and #[strong F-score].
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+item
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| #[strong Save] the trained model using
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| #[+api("language#to_disk") #[code nlp.to_disk]].
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+item
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| #[strong Test] the model to make sure the text classifier works as
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| expected.
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