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app.py

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+import gradio as gr
+from datetime import date
+import json
+import csv
+import datetime
+import smtplib
+from email.mime.text import MIMEText
+import requests
+from transformers import AutoTokenizer, AutoModelWithLMHead 
+import gc
+import os
+import json
+import numpy as np
+from tqdm import trange
+import torch
+import torch.nn.functional as F
+from bert_ner_model_loader import Ner
+import pandas as pd
+
+cwd = os.getcwd()
+bert_ner_model = os.path.join(cwd)
+Entities_Found =[]
+Entity_Types = []
+k = 0
+def generate_emotion(article):
+    text = "Input sentence: "
+    text += article
+    
+    model_ner = Ner(bert_ner_model)
+    
+    output = model_ner.predict(text)
+    print(output)
+    k = 0
+    for i in output:
+        for j in i:
+            if k == 0:
+                Entities_Found.append(j)
+                k += 1
+            else:
+                Entity_Types.append(j)
+                k = 0
+    result = {'Entities Found':Entities_Found, 'Entity Types':Entity_Types}        
+    return pd.DataFrame(result)
+
+
+inputs=gr.Textbox(lines=10, label="Sentences",elem_id="inp_div")
+outputs = [gr.Dataframe(row_count = (2, "dynamic"), col_count=(2, "fixed"), label="Here is the Result", headers=["Entities Found","Entity Types"])]
+
+demo = gr.Interface(
+    generate_emotion,
+    inputs,
+    outputs,
+    title="Entity Recognition For Input Text",
+    description="Feel free to give your feedback", 
+    css=".gradio-container {background-color: lightgray} #inp_div {background-color: [#7](https://www1.example.com/issues/7)FB3D5;"
+)
+demo.launch()

bert_ner_model_loader.py

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+"""BERT NER Inference."""
+
+from __future__ import absolute_import, division, print_function
+
+import json
+import os
+
+import torch
+import torch.nn.functional as F
+from torch.nn import CrossEntropyLoss
+from torch.utils.data import DataLoader, RandomSampler, SequentialSampler, TensorDataset
+from torch.utils.data.distributed import DistributedSampler
+from tqdm import tqdm, trange
+from nltk import word_tokenize
+# from transformers import (BertConfig, BertForTokenClassification,
+                                #   BertTokenizer)
+from pytorch_transformers import (BertForTokenClassification, BertTokenizer)
+
+
+class BertNer(BertForTokenClassification):
+
+    def forward(self, input_ids, token_type_ids=None, attention_mask=None, valid_ids=None):
+        sequence_output = self.bert(input_ids, token_type_ids, attention_mask, head_mask=None)[0]
+        batch_size,max_len,feat_dim = sequence_output.shape
+        valid_output = torch.zeros(batch_size,max_len,feat_dim,dtype=torch.float32,device='cpu')
+        # valid_output = torch.zeros(batch_size,max_len,feat_dim,dtype=torch.float32,device='cuda' if torch.cuda.is_available() else 'cpu')
+        for i in range(batch_size):
+            jj = -1
+            for j in range(max_len):
+                    if valid_ids[i][j].item() == 1:
+                        jj += 1
+                        valid_output[i][jj] = sequence_output[i][j]
+        sequence_output = self.dropout(valid_output)
+        logits = self.classifier(sequence_output)
+        return logits
+
+class Ner:
+
+    def __init__(self,model_dir: str):
+        self.model , self.tokenizer, self.model_config = self.load_model(model_dir)
+        self.label_map = self.model_config["label_map"]
+        self.max_seq_length = self.model_config["max_seq_length"]
+        self.label_map = {int(k):v for k,v in self.label_map.items()}
+        self.device = "cpu"
+        # self.device = "cuda" if torch.cuda.is_available() else "cpu"
+        self.model = self.model.to(self.device)
+        self.model.eval()
+
+    def load_model(self, model_dir: str, model_config: str = "model_config.json"):
+        model_config = os.path.join(model_dir,model_config)
+        model_config = json.load(open(model_config))
+        model = BertNer.from_pretrained(model_dir)
+        tokenizer = BertTokenizer.from_pretrained(model_dir, do_lower_case=model_config["do_lower"])
+        return model, tokenizer, model_config
+
+    def tokenize(self, text: str):
+        """ tokenize input"""
+        words = word_tokenize(text)
+        tokens = []
+        valid_positions = []
+        for i,word in enumerate(words):
+            token = self.tokenizer.tokenize(word)
+            tokens.extend(token)
+            for i in range(len(token)):
+                if i == 0:
+                    valid_positions.append(1)
+                else:
+                    valid_positions.append(0)
+        # print("valid positions from text o/p:=>", valid_positions)
+        return tokens, valid_positions
+
+    def preprocess(self, text: str):
+        """ preprocess """
+        tokens, valid_positions = self.tokenize(text)
+        ## insert "[CLS]"
+        tokens.insert(0,"[CLS]")
+        valid_positions.insert(0,1)
+        ## insert "[SEP]"
+        tokens.append("[SEP]")
+        valid_positions.append(1)
+        segment_ids = []
+        for i in range(len(tokens)):
+            segment_ids.append(0)
+        input_ids = self.tokenizer.convert_tokens_to_ids(tokens)
+        # print("input ids with berttokenizer:=>", input_ids)
+        input_mask = [1] * len(input_ids)
+        while len(input_ids) < self.max_seq_length:
+            input_ids.append(0)
+            input_mask.append(0)
+            segment_ids.append(0)
+            valid_positions.append(0)
+        return input_ids,input_mask,segment_ids,valid_positions
+
+    def predict_entity(self, B_lab, I_lab, words, labels, entity_list):
+        temp=[]
+        entity=[]
+
+        for word, (label, confidence), B_l, I_l in zip(words, labels, B_lab, I_lab):
+
+            if ((label==B_l) or (label==I_l)) and label!='O':
+                if label==B_l:
+                    entity.append(temp)
+                    temp=[]
+                    temp.append(label)
+                    
+                temp.append(word)
+
+        entity.append(temp)
+        # print(entity)
+
+        entity_name_label = []
+        for entity_name in entity[1:]:
+            for ent_key, ent_value in entity_list.items():
+                if (ent_key==entity_name[0]):
+                    # entity_name_label.append(' '.join(entity_name[1:]) + ": " + ent_value)
+                    entity_name_label.append([' '.join(entity_name[1:]), ent_value])
+        
+        return entity_name_label
+
+    def predict(self, text: str):
+        input_ids,input_mask,segment_ids,valid_ids = self.preprocess(text)
+        # print("valid ids:=>", segment_ids)
+        input_ids = torch.tensor([input_ids],dtype=torch.long,device=self.device)
+        input_mask = torch.tensor([input_mask],dtype=torch.long,device=self.device)
+        segment_ids = torch.tensor([segment_ids],dtype=torch.long,device=self.device)
+        valid_ids = torch.tensor([valid_ids],dtype=torch.long,device=self.device)
+
+        with torch.no_grad():
+            logits = self.model(input_ids, segment_ids, input_mask,valid_ids)
+        # print("logit values:=>", logits)
+        logits = F.softmax(logits,dim=2)
+        # print("logit values:=>", logits[0])
+        logits_label = torch.argmax(logits,dim=2)
+        logits_label = logits_label.detach().cpu().numpy().tolist()[0]
+        # print("logits label value list:=>", logits_label)
+
+        logits_confidence = [values[label].item() for values,label in zip(logits[0],logits_label)]
+
+        logits = []
+        pos = 0
+        for index,mask in enumerate(valid_ids[0]):
+            if index == 0:
+                continue
+            if mask == 1:
+                logits.append((logits_label[index-pos],logits_confidence[index-pos]))
+            else:
+                pos += 1
+        logits.pop()
+        labels = [(self.label_map[label],confidence) for label,confidence in logits]
+        words = word_tokenize(text)
+
+        entity_list = {'B-PER':'Person',
+                    'B-FAC':'Facility',
+                    'B-LOC':'Location',
+                    'B-ORG':'Organization',
+                    'B-ART':'Work Of Art',
+                    'B-EVENT':'Event',
+                    'B-DATE':'Date-Time Entity',
+                    'B-TIME':'Date-Time Entity',
+                    'B-LAW':'Law Terms',
+                    'B-PRODUCT':'Product',
+                    'B-PERCENT':'Percentage',
+                    'B-MONEY':'Currency',
+                    'B-LANGUAGE':'Langauge',
+                    'B-NORP':'Nationality / Religion / Political group',
+                    'B-QUANTITY':'Quantity',
+                    'B-ORDINAL':'Ordinal Number',
+                    'B-CARDINAL':'Cardinal Number'}
+        
+        B_labels=[]
+        I_labels=[]
+        for label, confidence in labels:
+            if (label[:1]=='B'):
+                B_labels.append(label)
+                I_labels.append('O')
+            elif (label[:1]=='I'):
+                I_labels.append(label)
+                B_labels.append('O')
+            else:
+                B_labels.append('O')
+                I_labels.append('O')
+
+        assert len(labels) == len(words) == len(I_labels) == len(B_labels)
+
+        output = self.predict_entity(B_labels, I_labels, words, labels, entity_list)
+        print(output)
+
+        # output = [{"word":word,"tag":label,"confidence":confidence} for word,(label,confidence) in zip(words,labels)]
+        return output
+
+