examples/onnx/ro_bert_a/ro_bert_a.py

#
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# to you under the Apache License, Version 2.0 (the
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import os
import numpy as np

from singa import device
from singa import tensor
from singa import sonnx
from singa import autograd
import onnx

import sys
sys.path.append(os.path.dirname(__file__) + '/..')
from utils import download_model, check_exist_or_download

import logging
logging.basicConfig(level=logging.INFO, format='%(asctime)-15s %(message)s')

from transformers import RobertaTokenizer

tokenizer = RobertaTokenizer.from_pretrained('roberta-base')

def preprocess():
    text = "This film is so good"
    tokens = tokenizer.encode(text, add_special_tokens=True)
    tokens = np.array(tokens)
    return tokens.reshape([1, -1]).astype(np.float32)

class MyModel(sonnx.SONNXModel):

    def __init__(self, onnx_model):
        super(MyModel, self).__init__(onnx_model)

    def forward(self, *x):
        y = super(MyModel, self).forward(*x)
        return y[0]

    def train_one_batch(self, x, y):
        pass


if __name__ == "__main__":
    url = 'https://media.githubusercontent.com/media/onnx/models/master/text/machine_comprehension/roberta/model/roberta-sequence-classification-9.tar.gz'
    download_dir = '/tmp/'
    model_path = os.path.join(download_dir, 'roberta-sequence-classification-9', 'roberta-sequence-classification-9.onnx')

    logging.info("onnx load model...")
    download_model(url)
    onnx_model = onnx.load(model_path)

    # inference
    logging.info("preprocessing...")
    input_ids = preprocess()

    logging.info("model compling...")
    dev = device.get_default_device()
    x = tensor.Tensor(device=dev, data=input_ids)
    model = MyModel(onnx_model)

    # verifty the test
    # from utils import load_dataset
    # sg_ir = sonnx.prepare(onnx_model) # run without graph
    # inputs, ref_outputs = load_dataset(
    #     os.path.join('/tmp', 'roberta-sst-9', 'test_data_set_0'))
    # outputs = sg_ir.run(inputs)
    # for ref_o, o in zip(ref_outputs, outputs):
    #     np.testing.assert_almost_equal(ref_o, o, 4)

    logging.info("model running...")
    y = model.forward(x)
    y = autograd.reshape(y, y.shape[-2:])[-1, :]
    y = tensor.softmax(y)
    y = tensor.to_numpy(y)[0]
    y = np.argsort(y)[::-1]
    if(y[0] == 0):
        print("Prediction: negative")
    else:
        print("Prediction: positive")