bert-gts-absa-triple-restaurant

Dataset Domain: Restaurant Reviews

Overview

This work is based on Grid Tagging Scheme for Aspect-oriented Fine-grained Opinion Extraction.The code from their github repository was also utilized along with their dataset.

This model requires custom code as it uses GridTaggingScheme to predict the labels on the input. For the convenience, the custom code and model architecture has been included with the model.

Example Code for inferencing

STEP 1 (Installing huggingface lib)

pip install --upgrade huggingface_hub

STEP 2 (Download the custom code and model to predict opinion target, opinion span and sentiment polarity)

from huggingface_hub import hf_hub_download
import sys
# Download the custom model code
bert_gts_pretrained = hf_hub_download(repo_id='gauneg/bert-gts-absa-triple-restaurant', filename="bert_opinion.py")
post =  hf_hub_download(repo_id='gauneg/bert-gts-absa-triple-restaurant', filename="post.py")

sys.path.append(bert_gts_pretrained.rsplit("/", 1)[0])
sys.path.append(post.rsplit("/", 1)[0])


from bert_opinion import BertGTSOpinionTriple
from post import DecodeAndEvaluate


from transformers import AutoTokenizer


model_id = 'gauneg/bert-gts-absa-triple-restaurant'
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = BertGTSOpinionTriple.from_pretrained(model_id)
dec_and_infer = DecodeAndEvaluate(tokenizer)
test_sentence0 = """The food was good but the ambience was bad"""



# prediction
print(dec_and_infer.decode_predict_string_one(test_sentence, model, max_len=128))

Expected output

[['food', 'good', 'positive'], ['ambience', 'bad', 'negative']]

DETAILS

The model has been trained to use Grid Tagging Scheme (GTS) to predict Opinion Target, Opinion Span and Sentiment Polarity. For the purpose of training this model the domain specific datasets (laptop and restaurant reviews) were combined. The grid tagging example is shown in the following diagram:

<figure> <img src="./example_gts.png" alt="gts-image" style="width:45%"> <figcaption>Fig 1. Grid tagging Scheme from <a href="https://aclanthology.org/2020.findings-emnlp.234/">(Wu et al., Findings 2020)</a> </figcaption> </figure>

In the above sentence there are two absa triples. Each triple is expressed in the following order:

[<span style="color:red">Aspect Term/Opinion Target</span>, <span style="color:#7393B3">opinion span</span>, <span style="color:purple">sentiment polarity</span>]

The model and sample code as shown in the snippet with extract opinion triplets as: [ [<span style="color:red">hot dogs</span>, <span style="color:#7393B3">top notch</span>, <span style="color:purple">positive</span>], [<span style="color:red">coffee</span>, <span style="color:#7393B3">avergae</span>, <span style="color:purple">neutral</span>] ]

Definitions <a href="https://aclanthology.org/2020.findings-emnlp.234/">(Wu et al., Findings 2020)</a>:

1. <span style="color:red">Aspect Term/Opinion Target</span>: Aspect term, also known as opinion target, is the word or phrase in a sentence representing feature or entity of products or services.
2. <span style="color:#7393B3">Opinion Term </span>: Opinion Term refers to the term in a sentence used to express attitudes or opinions explicitly.
3. <span style="color:purple">Sentiment Polarity</span>: This is the sentiment expressed.