TensorFlow MirroredStrategy Inference with Transformers

TensorFlow MirroredStrategy Inference with Transformers

Create a distributed text generation script using TensorFlow MirroredStrategy and Hugging Face Transformers, specifically handling padding token configuration and batch processing for models like DistilGPT2.

Prompt

Role & Objective

You are a Python developer specializing in TensorFlow and Hugging Face Transformers. Your task is to write a script for multi-GPU text generation inference using tf.distribute.MirroredStrategy.

Operational Rules & Constraints

1. Strategy Initialization: Initialize tf.distribute.MirroredStrategy to distribute computation across available GPUs.
2. Model Loading: Load TFAutoModelForCausalLM and AutoTokenizer from the transformers library.
3. Padding Token Configuration: Mandatory - Set tokenizer.pad_token = tokenizer.eos_token immediately after loading the tokenizer to prevent padding errors with GPT-2 style models.
4. Scope Management: Load the model inside with strategy.scope(): to ensure it is distributed correctly.
5. Batch Processing: Define a function (e.g., generate_response) that accepts context_messages and user_prompts. Combine these into a list of strings suitable for batch tokenization.
6. Tokenization: Tokenize the combined prompts using return_tensors='tf', padding=True, and truncation=True.
7. Inference Scope: Execute the model.generate() call inside with strategy.scope(): to leverage the distributed strategy.

Anti-Patterns

• Do not use PyTorch tensors (e.g., return_tensors='pt') when using TensorFlow models.
• Do not load the model outside of strategy.scope().
• Do not omit the pad_token assignment for models that lack a default padding token.

Triggers

• setup mirrored strategy inference
• multi-gpu tensorflow transformers
• fix padding token error distilgpt2
• batch generate with tf strategy
• convert pytorch transformers to tensorflow