collatable 0.1.1

Constructing batched tensors for any machine learning tasks

Collatable

Constructing batched tensors for any machine learning tasks

Installation

pip install collatable

Examples

The following scripts show how to tokenize/index/collate your dataset with collatable:

Text Classification

import collatable
from collatable import Instance, LabelField, MetadataField, TextField
from collatable.extras.indexer import LabelIndexer, TokenIndexer

dataset = [
    ("this is awesome", "positive"),
    ("this is a bad movie", "negative"),
    ("this movie is an awesome movie", "positive"),
    ("this movie is too bad to watch", "negative"),
]

# Set up indexers for tokens and labels
PAD_TOKEN = "<PAD>"
UNK_TOKEN = "<UNK>"
token_indexer = TokenIndexer[str](specials=[PAD_TOKEN, UNK_TOKEN], default=UNK_TOKEN)
label_indexer = LabelIndexer[str]()

# Load training dataset
instances = []
with token_indexer.context(train=True), label_indexer.context(train=True):
    for id_, (text, label) in dataset:
        # Prepare each field with the corresponding field class
        text_field = TextField(
            text.split(),
            indexer=token_indexer,
            padding_value=token_indexer[PAD_TOKEN],
        )
        label_field = LabelField(
            label,
            indexer=label_indexer,
        )
        metadata_field = Metadata({"id": id_})
        # Combine these fields into instance
        instance = Instance(
            text=text_field,
            label=label_field,
            metadata=metadata_field,
        )
        instances.append(instance)

# Collate instances and build batch
output = collatable.collate(instances)
print(output)

Execution result:

{'label': array([0, 1, 0, 1], dtype=int32),
 'metadata': [{'id': 0}, {'id': 1}, {'id': 2}, {'id': 3}],
 'text': {
    'token_ids': array([[ 3,  4,  5,  0,  0,  0,  0],
                        [ 3,  4,  6,  7,  8,  0,  0],
                        [ 3,  8,  4,  9,  5,  8,  0],
                        [ 3,  8,  4, 10,  7, 11, 12]]),
    'lengths': array([3, 5, 6, 7])}}

Sequence Labeling

import collatable
from collatable import Instance, SequenceLabelField, TextField
from collatable.extras.indexer import LabelIndexer, TokenIndexer

dataset = [
    (["my", "name", "is", "john", "smith"], ["O", "O", "O", "B", "I"]),
    (["i", "lived", "in", "japan", "three", "years", "ago"], ["O", "O", "O", "U", "O", "O", "O"]),
]

# Set up indexers for tokens and labels
PAD_TOKEN = "<PAD>"
token_indexer = TokenIndexer[str](specials=(PAD_TOKEN,))
label_indexer = LabelIndexer[str]()

# Load training dataset
instances = []
with token_indexer.context(train=True), label_indexer.context(train=True):
    for tokens, labels in dataset:
        text_field = TextField(tokens, indexer=token_indexer, padding_value=token_indexer[PAD_TOKEN])
        label_field = SequenceLabelField(labels, text_field, indexer=label_indexer)
        instance = Instance(text=text_field, label=label_field)
        instances.append(instance)

output = collatable.collate(instances)
print(output)

Execution result:

{'text': {
    'token_ids': array([[ 1,  2,  3,  4,  5,  0,  0],
                        [ 6,  7,  8,  9, 10, 11, 12]]),
    'lengths': array([5, 7])},
 'label': array([[0, 0, 0, 1, 2, 0, 0],
                 [0, 0, 0, 3, 0, 0, 0]])}

Relation Extraction

from collatable.extras.indexer import LabelIndexer, TokenIndexer
from collatable.fields.adjacency_field import AdjacencyField
from collatable.fields.list_field import ListField
from collatable.fields.span_field import SpanField
from collatable.fields.text_field import TextField
from collatable.instance import Instance

PAD_TOKEN = "<PAD>"
token_indexer = TokenIndexer[str](specials=(PAD_TOKEN,))
label_indexer = LabelIndexer[str]()

instances = []
with token_indexer.context(train=True), label_indexer.context(train=True):
    text = TextField(
        ["john", "smith", "was", "born", "in", "new", "york", "and", "now", "lives", "in", "tokyo"],
        indexer=token_indexer,
        padding_value=token_indexer[PAD_TOKEN],
    )
    spans = ListField([SpanField(0, 2, text), SpanField(5, 7, text), SpanField(11, 12, text)])
    relations = AdjacencyField([(0, 1), (0, 2)], spans, labels=["born-in", "lives-in"], indexer=label_indexer)
    instance = Instance(text=text, spans=spans, relations=relations)
    instances.append(instance)

    text = TextField(
        ["tokyo", "is", "the", "capital", "of", "japan"],
        indexer=token_indexer,
        padding_value=token_indexer[PAD_TOKEN],
    )
    spans = ListField([SpanField(0, 1, text), SpanField(5, 6, text)])
    relations = AdjacencyField([(0, 1)], spans, labels=["capital-of"], indexer=label_indexer)
    instance = Instance(text=text, spans=spans, relations=relations)
    instances.append(instance)

output = Instance.collate(instances)
print(output)

Execution result:

{'text': {
    'token_ids': array([[ 1,  2,  3,  4,  5,  6,  7,  8,  9, 10,  5, 11],
                        [11, 12, 13, 14, 15, 16,  0,  0,  0,  0,  0,  0]]),
    'lengths': array([12,  6])},
 'spans': array([[[ 0,  2],
                  [ 5,  7],
                  [11, 12]],
                 [[ 0,  1],
                  [ 5,  6],
                  [-1, -1]]]),
 'relations': array([[[-1,  0,  1],
                      [-1, -1, -1],
                      [-1, -1, -1]],

                     [[-1,  2, -1],
                      [-1, -1, -1],
                      [-1, -1, -1]]], dtype=int32)}