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pythondatasetsactive-learningtext-annotationdatasetnatural-language-processingdata-labelingmachine-learningannotation-tool
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102 lines
3.3 KiB
102 lines
3.3 KiB
import abc
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import collections.abc
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import dataclasses
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from typing import Any, Dict, Iterator, List
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from .cleaners import Cleaner
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from .exceptions import FileParseException
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from .labeled_examples import LabeledExamples, Record
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DEFAULT_TEXT_COLUMN = "text"
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DEFAULT_LABEL_COLUMN = "label"
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class BaseReader(collections.abc.Iterable):
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"""Reader has a role to parse files and return a Record iterator."""
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@abc.abstractmethod
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def __iter__(self) -> Iterator[Record]:
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"""Creates an iterator for elements of this dataset.
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Returns:
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A `Record` for the elements of this dataset.
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"""
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raise NotImplementedError("Please implement this method in the subclass.")
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@property
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@abc.abstractmethod
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def errors(self):
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raise NotImplementedError("Please implement this method in the subclass.")
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@abc.abstractmethod
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def batch(self, batch_size: int) -> Iterator[LabeledExamples]:
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raise NotImplementedError("Please implement this method in the subclass.")
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class Parser(abc.ABC):
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"""The abstract file parser."""
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@abc.abstractmethod
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def parse(self, filename: str) -> Iterator[Dict[Any, Any]]:
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"""Parses the file and returns the dictionary."""
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raise NotImplementedError("Please implement this method in the subclass.")
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@property
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def errors(self) -> List[FileParseException]:
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"""Returns parsing errors."""
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return []
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@dataclasses.dataclass
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class FileName:
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full_path: str
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generated_name: str
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upload_name: str
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class Builder(abc.ABC):
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"""The abstract Record builder."""
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@abc.abstractmethod
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def build(self, row: Dict[Any, Any], filename: FileName, line_num: int) -> Record:
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"""Builds the record from the dictionary."""
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raise NotImplementedError("Please implement this method in the subclass.")
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class Reader(BaseReader):
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def __init__(self, filenames: List[FileName], parser: Parser, builder: Builder, cleaner: Cleaner):
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self.filenames = filenames
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self.parser = parser
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self.builder = builder
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self.cleaner = cleaner
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self._errors: List[FileParseException] = []
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def __iter__(self) -> Iterator[Record]:
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for filename in self.filenames:
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rows = self.parser.parse(filename.full_path)
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for line_num, row in enumerate(rows, start=1):
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try:
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record = self.builder.build(row, filename, line_num)
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maybe_error = record.clean(self.cleaner)
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if maybe_error:
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self._errors.append(maybe_error)
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yield record
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except FileParseException as e:
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self._errors.append(e)
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def batch(self, batch_size: int) -> Iterator[LabeledExamples]:
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batch = []
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for record in self:
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batch.append(record)
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if len(batch) == batch_size:
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yield LabeledExamples(batch)
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batch = []
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if batch:
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yield LabeledExamples(batch)
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@property
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def errors(self) -> List[FileParseException]:
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"""Aggregates parser and builder errors."""
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errors = self.parser.errors + self._errors
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errors.sort(key=lambda error: error.line_num)
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return [error.dict() for error in errors]
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