[Question]: Why is the performance of GPTTokenizer much worse than Tiktoken?

[openvino-book]

请提出你的问题

Run the benchmark code

from paddlenlp.transformers import GPTTokenizer
import tiktoken as tik
import time
import statistics

def benchmark_tokenizers(text, num_iterations=1000):
    # 初始化tokenizers
    paddle_tokenizer = GPTTokenizer.from_pretrained(
        "gpt2-en",
        bos_token='<|endoftext|>'
    )
    tik_tokenizer = tik.get_encoding("gpt2")
    
    # 测试编码性能
    paddle_encode_times = []
    tik_encode_times = []
    
    for _ in range(num_iterations):
        # PaddleNLP tokenizer
        start = time.perf_counter()
        paddle_tokens = paddle_tokenizer.encode(text)
        paddle_encode_times.append(time.perf_counter() - start)
        
        # Tiktoken
        start = time.perf_counter()
        tik_tokens = tik_tokenizer.encode(text)
        tik_encode_times.append(time.perf_counter() - start)
    
    # 测试解码性能
    paddle_decode_times = []
    tik_decode_times = []
    
    for _ in range(num_iterations):
        # PaddleNLP tokenizer
        start = time.perf_counter()
        paddle_tokenizer.decode(paddle_tokens.input_ids)
        paddle_decode_times.append(time.perf_counter() - start)
        
        # Tiktoken
        start = time.perf_counter()
        tik_tokenizer.decode(tik_tokens)
        tik_decode_times.append(time.perf_counter() - start)
    
    return {
        "paddle_encode_avg": statistics.mean(paddle_encode_times) * 1000,  # 转换为毫秒
        "tik_encode_avg": statistics.mean(tik_encode_times) * 1000,
        "paddle_decode_avg": statistics.mean(paddle_decode_times) * 1000,
        "tik_decode_avg": statistics.mean(tik_decode_times) * 1000
    }

# 测试文本
text = """Hello, World! How are you doing today? What's the weather like in Beijing? 
This is a longer text sample to get more accurate benchmarking results. 
We need to process enough text to get meaningful performance measurements."""

# 运行基准测试
results = benchmark_tokenizers(text)

# 打印结果
print(f"\nPerformance Comparison (average time in milliseconds):")
print(f"{'=' * 50}")
print(f"PaddleNLP Tokenizer:")
print(f"  Encoding: {results['paddle_encode_avg']:.4f} ms")
print(f"  Decoding: {results['paddle_decode_avg']:.4f} ms")
print(f"\nTiktoken:")
print(f"  Encoding: {results['tik_encode_avg']:.4f} ms")
print(f"  Decoding: {results['tik_decode_avg']:.4f} ms")

You will see the performance of GPTTokenizer is much worse than Tiktoken