import gradio as gr
from transformers import pipeline
import time
import neural_compressor
from optimum.intel.neural_compressor import IncQuantizedModelForQuestionAnswering

model_id = "Intel/bert-base-uncased-squadv1.1-sparse-80-1x4-block-pruneofa"
# model_id = "Intel/distilbert-base-uncased-squadv1.1-sparse-80-1x4-block-pruneofa-int8"
int8_model = IncQuantizedModelForQuestionAnswering.from_pretrained(model_id)

# sparse_qa_pipeline = pipeline(task="question-answering",model="Intel/bert-base-uncased-squadv1.1-sparse-80-1x4-block-pruneofa")
# sparse_qa_pipeline = pipeline(task="question-answering",model="Intel/distilbert-base-uncased-squadv1.1-sparse-80-1x4-block-pruneofa-int8")

dense_qa_pipeline = pipeline(task="question-answering",model="csarron/bert-base-uncased-squad-v1")
# dense_qa_pipeline = pipeline(task="question-answering",model="distilbert-base-uncased-distilled-squad")


def predict(context,question):
    '''
    Sample prediction should return a dictionary of the form:
    {'score': 0.9376363158226013, 'start': 10, 'end': 15, 'answer': 'seven'}
    Score is the probability confidence score
    Start is the starting character where it found the answer
    End is the ending character where it found the answer
    Answer is the part of the text it drew its answer from.
    '''
    
    sparse_start_time = time.perf_counter()
    sparse_predictions = int8_model(context=context,question=question)
    sparse_end_time = time.perf_counter()
    sparse_duration = (sparse_end_time - sparse_start_time) * 1000
    sparse_answer = sparse_predictions['answer']
    
    dense_start_time = time.perf_counter()
    dense_predictions = dense_qa_pipeline(context=context,question=question)
    dense_end_time = time.perf_counter()
    dense_duration = (dense_end_time - dense_start_time) * 1000
    dense_answer = dense_predictions['answer']

    return sparse_answer,sparse_duration,dense_answer,dense_duration

md = """
If you came looking for chatGPT, sorry to disappoint, but this is different. This prediction model is designed to answer a question about a given input text. It is designed to do reading comprehension. The model does not just answer questions in general -- it only works from the text that you provide. However, automated reading comprehension can be a valuable task.

The model is based on the Zafrir et al. (2021) paper: [Prune Once for All: Sparse Pre-Trained Language Models](https://arxiv.org/abs/2111.05754). The model can be found here: https://huggingface.co/Intel/bert-base-uncased-squadv1.1-sparse-80-1x4-block-pruneofa. The main idea of this BERT-Base model is that it is much more fast and efficient in deployment than its dense counterpart: (https://huggingface.co/csarron/bert-base-uncased-squad-v1). It has had weight pruning and model distillation applied to create a sparse weight pattern that is maintained even after fine-tuning has been applied. According to Zafrir et al. (2016), their "results show the best compression-to-accuracy ratio for BERT-Base". This model is still in FP32, but can be quantized to INT8 with the [Intel® Neural Compressor](https://github.com/intel/neural-compressor) for further compression. 

The training dataset used is the English Wikipedia dataset (2500M words), and then fine-tuned on the SQuADv1.1 dataset containing 89K training examples, compiled by Rajpurkar et al. (2016): [100, 000+ Questions for Machine Comprehension of Text](https://arxiv.org/abs/1606.05250).

Author of Hugging Face Space: Benjamin Consolvo, AI Solutions Engineer Manager at Intel | Date last updated: 01/05/2023
"""

# predict()
context=gr.Text(lines=10,label="Context")
question=gr.Text(label="Question")
sparse_answer=gr.Text(label="Sparse Answer")
sparse_duration=gr.Text(label="Sparse latency (ms)")

dense_answer=gr.Text(label="Dense Answer")
dense_duration=gr.Text(label="Dense latency (ms)")

apple_context = "An apple is an edible fruit produced by an apple tree (Malus domestica). Apple trees are cultivated worldwide and are the most widely grown species in the genus Malus. The tree originated in Central Asia, where its wild ancestor, Malus sieversii, is still found today. Apples have been grown for thousands of years in Asia and Europe and were brought to North America by European colonists. Apples have religious and mythological significance in many cultures, including Norse, Greek, and European Christian tradition. Apples grown from seed tend to be very different from those of their parents, and the resultant fruit frequently lacks desired characteristics. Generally, apple cultivars are propagated by clonal grafting onto rootstocks. Apple trees grown without rootstocks tend to be larger and much slower to fruit after planting. Rootstocks are used to control the speed of growth and the size of the resulting tree, allowing for easier harvesting."
apple_question = "How many years have apples been grown for?"

iface = gr.Interface(
    fn=predict, 
    inputs=[context,question],
    outputs=[sparse_answer,sparse_duration,dense_answer,dense_duration],
    examples=[[apple_context,apple_question]],
    title = "Question & Answer with Sparse BERT using the SQuAD dataset",
    description = md
    )

iface.launch()