nlp-pipeline-builder（NLP 管道构建器）

NLP Pipeline Builder

Overview

Specialized ML pipelines for natural language processing. Handles text preprocessing, tokenization, transformer models (BERT, RoBERTa, GPT), fine-tuning, and deployment for production NLP systems.

NLP Tasks Supported

1. Text Classification

from specweave import NLPPipeline

# Binary or multi-class text classification
pipeline = NLPPipeline(
    task="classification",
    classes=["positive", "negative", "neutral"],
    increment="0042"
)

# Automatically configures:
# - Text preprocessing (lowercase, clean)
# - Tokenization (BERT tokenizer)
# - Model (BERT, RoBERTa, DistilBERT)
# - Fine-tuning on your data
# - Inference pipeline

pipeline.fit(train_texts, train_labels)

2. Named Entity Recognition (NER)

# Extract entities from text
pipeline = NLPPipeline(
    task="ner",
    entities=["PERSON", "ORG", "LOC", "DATE"],
    increment="0042"
)

# Returns: [(entity_text, entity_type, start_pos, end_pos), ...]

3. Sentiment Analysis

# Sentiment classification (specialized)
pipeline = NLPPipeline(
    task="sentiment",
    increment="0042"
)

# Fine-tuned for sentiment (positive/negative/neutral)

4. Text Generation

# Generate text continuations
pipeline = NLPPipeline(
    task="generation",
    model="gpt2",
    increment="0042"
)

# Fine-tune on your domain-specific text

Best Practices for NLP

Text Preprocessing

from specweave import TextPreprocessor

preprocessor = TextPreprocessor(increment="0042")

# Standard preprocessing
preprocessor.add_steps([
    "lowercase",
    "remove_html",
    "remove_urls",
    "remove_emails",
    "remove_special_chars",
    "remove_extra_whitespace"
])

# Advanced preprocessing
preprocessor.add_advanced([
    "spell_correction",
    "lemmatization",
    "stopword_removal"
])

Model Selection

Text Classification:

• Small datasets (<10K): DistilBERT (6x faster than BERT)
• Medium datasets (10K-100K): BERT-base
• Large datasets (>100K): RoBERTa-large

NER:

• General: BERT + CRF layer
• Domain-specific: Fine-tune BERT on domain corpus

Sentiment:

• Product reviews: DistilBERT fine-tuned on Amazon reviews
• Social media: RoBERTa fine-tuned on Twitter

Transfer Learning

# Start from pre-trained language models
pipeline = NLPPipeline(task="classification")

# Option 1: Use pre-trained (no fine-tuning)
pipeline.use_pretrained("distilbert-base-uncased")

# Option 2: Fine-tune on your data
pipeline.use_pretrained_and_finetune(
    model="bert-base-uncased",
    epochs=3,
    learning_rate=2e-5
)

Handling Long Text

# For text longer than 512 tokens
pipeline = NLPPipeline(
    task="classification",
    max_length=512,
    truncation_strategy="head_and_tail"  # Keep start + end
)

# Or use Longformer for long documents
pipeline.use_model("longformer")  # Handles 4096 tokens

Integration with SpecWeave

# NLP increment structure
.specweave/increments/0042-sentiment-classifier/
├── spec.md
├── data/
│   ├── train.csv
│   ├── val.csv
│   └── test.csv
├── models/
│   ├── tokenizer/
│   ├── model-epoch-1/
│   ├── model-epoch-2/
│   └── model-epoch-3/
├── experiments/
│   ├── distilbert-baseline/
│   ├── bert-base-finetuned/
│   └── roberta-large/
└── deployment/
    ├── model.onnx
    └── inference.py

Commands

/ml:nlp-pipeline --task classification --model bert-base
/ml:nlp-evaluate 0042  # Evaluate on test set
/ml:nlp-deploy 0042    # Export for production

Quick setup for NLP projects with state-of-the-art transformer models.