app.py

import paddle
import numpy as np
import random
from paddlenlp.transformers import SkepTokenizer, SkepModel
import gradio as gr
from seqeval.metrics.sequence_labeling import get_entities
label_ext_path = "./data/data121190/label_ext.dict"
label_cls_path = "./data/data121242/label_cls.dict"
ext_model_path = "./best_ext.pdparams"
cls_model_path = "./best_cls.pdparams"
def set_seed(seed):
    paddle.seed(seed)
    random.seed(seed)
    np.random.seed(seed)
def format_print(results):
    for result in results:
        aspect, opinion = result[0], set(result[1:])
        print(f"aspect: {aspect}, opinion: {opinion}\n")

def decoding(text, tag_seq):
    assert len(text) == len(tag_seq), f"text len: {len(text)}, tag_seq len: {len(tag_seq)}"

    puncs = list(",.?;!，。？；！")
    splits = [idx for idx in range(len(text)) if text[idx] in puncs]

    prev = 0
    sub_texts, sub_tag_seqs = [], []
    for i, split in enumerate(splits):
        sub_tag_seqs.append(tag_seq[prev:split])
        sub_texts.append(text[prev:split])
        prev = split
    sub_tag_seqs.append(tag_seq[prev:])
    sub_texts.append((text[prev:]))

    ents_list = []
    for sub_text, sub_tag_seq in zip(sub_texts, sub_tag_seqs):
        ents = get_entities(sub_tag_seq, suffix=False)
        ents_list.append((sub_text, ents))

    aps = []
    no_a_words = []
    for sub_tag_seq, ent_list in ents_list:
        sub_aps = []
        sub_no_a_words = []
        # print(ent_list)
        for ent in ent_list:
            ent_name, start, end = ent
            if ent_name == "Aspect":
                aspect = sub_tag_seq[start:end+1]
                sub_aps.append([aspect])
                if len(sub_no_a_words) > 0:
                    sub_aps[-1].extend(sub_no_a_words)
                    sub_no_a_words.clear()
            else:
                ent_name == "Opinion"
                opinion = sub_tag_seq[start:end + 1]
                if len(sub_aps) > 0:
                    sub_aps[-1].append(opinion)
                else:
                    sub_no_a_words.append(opinion)

        if sub_aps:
            aps.extend(sub_aps)
            if len(no_a_words) > 0:
                aps[-1].extend(no_a_words)
                no_a_words.clear()
        elif sub_no_a_words:
            if len(aps) > 0:
                aps[-1].extend(sub_no_a_words)
            else:
                no_a_words.extend(sub_no_a_words)

    if no_a_words:
        no_a_words.insert(0, "None")
        aps.append(no_a_words)

    return aps 
    
def is_aspect_first(text, aspect, opinion_word):
    return text.find(aspect) <= text.find(opinion_word)

def concate_aspect_and_opinion(text, aspect, opinion_words):
    aspect_text = ""
    for opinion_word in opinion_words:
        if is_aspect_first(text, aspect, opinion_word):
            aspect_text += aspect+opinion_word+"，"
        else:
            aspect_text += opinion_word+aspect+"，"
    aspect_text = aspect_text[:-1]

    return aspect_text

def format_print(results):
    for result in results:
        aspect, opinions, sentiment = result["aspect"], result["opinions"], result["sentiment"]
        print(f"aspect: {aspect}, opinions: {opinions}, sentiment: {sentiment}")
    print()
    return f"aspect: {aspect}, opinions: {opinions}, sentiment: {sentiment}"

def is_target_first(text, target, word):
    return text.find(target) <= text.find(word)


def ext_load_dict(dict_path):
    with open(dict_path, "r", encoding="utf-8") as f:
        words = [word.strip() for word in f.readlines()]
        word2id = dict(zip(words, range(len(words))))
        id2word = dict((v, k) for k, v in word2id.items())

        return word2id, id2word


def cls_load_dict(dict_path):
    with open(dict_path, "r", encoding="utf-8") as f:
        words = [word.strip() for word in f.readlines()]
        word2id = dict(zip(words, range(len(words))))
        id2word = dict((v, k) for k, v in word2id.items())

        return word2id, id2word


def read(data_path):
    with open(data_path, "r", encoding="utf-8") as f:
        for line in f.readlines():
            items = line.strip().split("\t")
            assert len(items) == 3
            example = {"label": int(
                items[0]), "target_text": items[1], "text": items[2]}

            yield example


def convert_example_to_feature(example, tokenizer, label2id,  max_seq_len=512, is_test=False):
    encoded_inputs = tokenizer(
        example["target_text"], text_pair=example["text"], max_seq_len=max_seq_len, return_length=True)

    if not is_test:
        label = example["label"]
        return encoded_inputs["input_ids"], encoded_inputs["token_type_ids"], encoded_inputs["seq_len"], label

    return encoded_inputs["input_ids"], encoded_inputs["token_type_ids"], encoded_inputs["seq_len"]
class SkepForTokenClassification(paddle.nn.Layer):
    def __init__(self, skep, num_classes=2, dropout=None):
        super(SkepForTokenClassification, self).__init__()
        self.num_classes = num_classes
        self.skep = skep
        self.dropout = paddle.nn.Dropout(
            dropout if dropout is not None else self.skep.config["hidden_dropout_prob"])
        self.classifier = paddle.nn.Linear(
            self.skep.config["hidden_size"], num_classes)

    def forward(self, input_ids, token_type_ids=None, position_ids=None, attention_mask=None):
        sequence_output, _ = self.skep(
            input_ids, token_type_ids=token_type_ids, position_ids=position_ids, attention_mask=attention_mask)

        sequence_output = self.dropout(sequence_output)
        logits = self.classifier(sequence_output)
        return logits
class SkepForSequenceClassification(paddle.nn.Layer):
    def __init__(self, skep, num_classes=2, dropout=None):
        super(SkepForSequenceClassification, self).__init__()
        self.num_classes = num_classes
        self.skep = skep
        self.dropout = paddle.nn.Dropout(
            dropout if dropout is not None else self.skep.config["hidden_dropout_prob"])
        self.classifier = paddle.nn.Linear(
            self.skep.config["hidden_size"], num_classes)

    def forward(self, input_ids, token_type_ids=None, position_ids=None, attention_mask=None):
        _, pooled_output = self.skep(input_ids, token_type_ids=token_type_ids,
                                     position_ids=position_ids, attention_mask=attention_mask)

        pooled_output = self.dropout(pooled_output)
        logits = self.classifier(pooled_output)
        return logits
# load dict
model_name = "skep_ernie_1.0_large_ch"
target1_dir = "./skepTokenizer"
target2_dir = "./skepModel"
ext_label2id, ext_id2label = ext_load_dict(label_ext_path)
cls_label2id, cls_id2label = cls_load_dict(label_cls_path)
tokenizer = SkepTokenizer.from_pretrained(target1_dir)
print("label dict loaded.")

# load ext model
ext_state_dict = paddle.load(ext_model_path)
ext_skep = SkepModel.from_pretrained(target2_dir)
ext_model = SkepForTokenClassification(ext_skep, num_classes=len(ext_label2id))
ext_model.load_dict(ext_state_dict)
print("extraction model loaded.")

# load cls model
cls_state_dict = paddle.load(cls_model_path)
cls_skep = ext_skep
cls_model = SkepForSequenceClassification(
    cls_skep, num_classes=len(cls_label2id))
cls_model.load_dict(cls_state_dict)
print("classification model loaded.")
def predict(input_text):

    ext_model.eval()
    cls_model.eval()

    # processing input text
    encoded_inputs = tokenizer(list(input_text), is_split_into_words=True, max_seq_len=max_seq_len,)
    input_ids = paddle.to_tensor([encoded_inputs["input_ids"]])
    token_type_ids = paddle.to_tensor([encoded_inputs["token_type_ids"]])

    # extract aspect and opinion words
    logits = ext_model(input_ids, token_type_ids=token_type_ids)
    predictions = logits.argmax(axis=2).numpy()[0]
    tag_seq = [ext_id2label[idx] for idx in predictions][1:-1]
    aps = decoding(input_text, tag_seq)

    # predict sentiment for aspect with cls_model
    results = []
    for ap in aps:
        aspect = ap[0]
        opinion_words = list(set(ap[1:]))
        aspect_text = concate_aspect_and_opinion(input_text, aspect, opinion_words)
        
        encoded_inputs = tokenizer(aspect_text, text_pair=input_text, max_seq_len=max_seq_len, return_length=True)
        input_ids = paddle.to_tensor([encoded_inputs["input_ids"]])
        token_type_ids = paddle.to_tensor([encoded_inputs["token_type_ids"]])

        logits = cls_model(input_ids, token_type_ids=token_type_ids)
        prediction = logits.argmax(axis=1).numpy()[0]

        result = {"aspect": aspect, "opinions": opinion_words, "sentiment": cls_id2label[prediction]}
        results.append(result)

    # print results
    return format_print(results)
max_seq_len = 512
gr.Interface(inputs=["text"],outputs=["text"],fn= predict).launch()