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--- |
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language: |
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- fr |
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- en |
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--- |
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--- |
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language: |
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- en |
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- fr |
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--- |
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# Title-Paragraph Segmentation Model - ver 1.0 |
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<!-- Provide a quick summary of what the model is/does. --> |
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Formal Content Segmentation Model that belongs to *first order segmentation* (FOS) model family. It performs |
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`title-paragraph separation` task. |
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Architecture: |
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- E5-base Cross Encoder |
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Dataset: |
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- Custom Constrative Title-Paragraph Dataset based off `wikitext` |
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Performance: |
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- 89% acc on test set |
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Broader context: |
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1) The aim of FOS is to separate content types featured in raw instructured strings such as: |
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* text |
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* code |
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* tables |
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* list |
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* math formulas |
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* images |
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2) This will enable further processings such as *second order segmentation* (SOS) that |
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aims at generating semantic frontiers i.e segmenting: |
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* plain text into knowledge units |
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* code into functional blocks |
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* math formulas blocks into equations |
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* objects/concepts within an image |
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* videos into timestamped chapters |
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## Model Details |
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### Direct Use |
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###### Setup and Utilities |
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```python |
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from transformers import XLMRobertaPreTrainedModel, XLMRobertaModel, AutoTokenizer |
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from nltk.tokenize import line_tokenize |
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import torch |
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import torch.nn as nn |
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import torch.nn.functional as F |
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from torch.utils.data import DataLoader |
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from datasets import Dataset |
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#Utility Functions |
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def get_default_device(): |
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if torch.cuda.is_available(): |
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return torch.device('cuda') |
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elif torch.backends.mps.is_available(): |
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return torch.device('mps') |
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else: |
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return torch.device('cpu') |
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def to_device(data, device): |
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if isinstance(data, (list,tuple)): |
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return [to_device(x, device) for x in data] |
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elif isinstance(data, dict): |
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return {'input_ids':to_device(data['input_ids'],device),'attention_mask':to_device(data['attention_mask'],device)} |
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return data.to(device) |
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class DeviceDataLoader(): |
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def __init__(self, dl, device): |
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self.dl = dl |
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self.device = device |
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def __iter__(self): |
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for b in self.dl: |
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yield to_device(b, self.device) |
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def __len__(self): |
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return len(self.dl) |
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class IsoBN(nn.Module): |
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def __init__(self, hidden_size): |
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"""Init method""" |
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super().__init__() |
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self.register_parameter(name='cov', param=torch.nn.Parameter(torch.zeros(hidden_size, hidden_size))) |
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self.register_parameter(name='std', param=torch.nn.Parameter(torch.zeros(hidden_size))) |
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self.cov.requires_grad = False |
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self.std.requires_grad = False |
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def forward(self, input, momentum: float = 0.05, eps: float = 1e-3, beta: float = 0.5): |
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"""Forward method""" |
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if self.training: |
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x = input.detach() |
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n = x.size(0) |
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mean = x.mean(dim=0) |
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y = x - mean.unsqueeze(0) |
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std = (y ** 2).mean(0) ** 0.5 |
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cov = (y.t() @ y) / n |
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self.cov.data += momentum * (cov.data - self.cov.data) |
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self.std.data += momentum * (std.data - self.std.data) |
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corr = torch.clamp(self.cov / torch.ger(self.std, self.std), -1, 1) |
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gamma = (corr ** 2).mean(1) |
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denorm = (gamma * self.std) |
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scale = 1 / (denorm + eps) ** beta |
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E = torch.diag(self.cov).sum() |
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new_E = (torch.diag(self.cov) * (scale ** 2)).sum() |
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m = (E / (new_E + eps)) ** 0.5 |
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scale *= m |
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return input * scale.unsqueeze(0).detach() |
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class e5_base_CTSEG(XLMRobertaPreTrainedModel): |
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def __init__(self, config): |
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super().__init__(config) |
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self.e5 = XLMRobertaModel(config).from_pretrained('intfloat/multilingual-e5-base') |
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self.dropout = nn.Dropout(0.5) |
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self.linear_1 = nn.Linear(768,256) |
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self.linear_2 = nn.Linear(256,128) |
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self.linear_3 = nn.Linear(128,2) |
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self.relu = nn.ReLU() |
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self.isobn = IsoBN(768) |
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def forward(self, sent): |
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sent['input_ids'] = sent['input_ids'].reshape(sent['input_ids'].shape[0],-1) |
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sent['attention_mask'] = sent['attention_mask'].reshape(sent['attention_mask'].shape[0],-1) |
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hs= self.e5(input_ids=sent['input_ids'], attention_mask=sent['attention_mask']) |
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cls_hs = hs.last_hidden_state[:, 0] |
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cls_hs = self.isobn(cls_hs) |
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out = self.linear_1(cls_hs) |
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out = self.relu(out) |
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out = self.dropout(out) |
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out = self.linear_2(out) |
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out = self.relu(out) |
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out = self.dropout(out) |
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out = self.linear_3(out) |
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return out |
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def training_step(self, sent, labels): |
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out = self.forward(sent) |
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loss = F.cross_entropy(out, labels) |
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return loss |
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def validation_step(self, sent, labels): |
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out = self.forward(sent) |
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loss = F.cross_entropy(out, labels) |
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acc = accuracy(out, labels) |
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return {'val_acc':acc,'val_loss':loss.detach()} |
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def validation_epoch_end(self, metrics): |
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batch_losses = [x['val_loss'] for x in metrics] |
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batch_accs = [x['val_acc'] for x in metrics] |
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epoch_loss = torch.stack(batch_losses).mean().item() |
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epoch_acc = torch.stack(batch_accs).mean().item() |
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return {'val_loss':epoch_loss, 'val_acc':epoch_acc} |
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def epoch_end(self, epoch, result): |
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print("Epoch [{}], train_loss: {:.4f}, val_loss: {:.4f}, val_acc: {:.4f}".format( |
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epoch, result['train_loss'], result['val_loss'], result['val_acc'])) |
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def evaluate(self, val_loader): |
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self.eval() |
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metrics = [self.validation_step(sent,labels.type(torch.LongTensor).to(device, non_blocking=True)) for sent,labels in val_loader] |
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return self.validation_epoch_end(metrics) |
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def accuracy(out, labels): |
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return (out.argmax(dim=1) == labels).sum()/labels.numel() |
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``` |
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```python |
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tokenizer = AutoTokenizer.from_pretrained('intfloat/multilingual-e5-base') |
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model = e5_base_CTSEG.from_pretrained('ProfessorBob/title-par-segmentation') |
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device = get_default_device() |
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to_device(model,device) |
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``` |
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```python |
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def infer_block( |
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chunks, |
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batch_size: int = 8, |
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return_probability: bool = False, |
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tokenizer = tokenizer |
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): |
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""" Bulk Infer function""" |
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tok_text_bulk = tokenizer( |
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['query: ' + sent[0] +'[SEP]'+ sent[1] for sent in chunks], |
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padding='max_length', |
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truncation=True, |
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return_tensors='pt' |
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) |
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sentences = Dataset.from_dict({ |
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'input_ids': tok_text_bulk['input_ids'], |
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'attention_mask': tok_text_bulk['attention_mask'] |
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}) |
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sentences.set_format( |
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'torch', |
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columns=['input_ids','attention_mask'] |
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) |
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sentences = DataLoader( |
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sentences, |
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batch_size=batch_size, |
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pin_memory=True |
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) |
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sentences = DeviceDataLoader(sentences, device) |
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preds = list() |
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model.eval() |
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with torch.no_grad(): |
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for i, batch in enumerate(sentences): |
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out = model(batch) |
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if return_probability: |
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preds.extend((out.softmax(dim=1).cpu()[:, 1]).tolist()) |
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else: |
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preds.extend(out.argmax(dim=1).cpu().tolist()) |
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if device == torch.device('cuda'): |
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torch.cuda.empty_cache() |
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assert len(preds) == len(chunks) |
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return preds, out |
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def segmentation_pipeline(text): |
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block = line_tokenize(text) |
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chunks = [ |
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(u, v) for u, v in zip(block[:-1], block[1:]) |
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] |
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preds, out = infer_block(chunks,return_probability=False) |
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cut_idx = [i+1 for i, value in enumerate(preds) if value == 1] |
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cut_idx = [0]+cut_idx+[len(block)] |
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seg = [block[cut_idx[i]:cut_idx[i+1]] for i in range(len(cut_idx)-1)] |
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return seg |
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``` |
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###### Usage example |
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```python |
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mixed_string = """ |
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Ancient Foundations (3000 BCE - 600 CE) |
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In the dawn of human civilization, mathematics emerged as an essential tool for commerce, construction, and astronomy. Explore the mathematical innovations of ancient cultures such as the Babylonians, Egyptians, and Greeks, laying the groundwork for numerical systems, geometry, and the Pythagorean theorem. |
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The Golden Age of Islamic Mathematics (700 CE - 1300 CE) |
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Delve into the intellectual flourishing during the Islamic Golden Age, where scholars like Al-Khwarizmi and Omar Khayyam made groundbreaking contributions to algebra, trigonometry, and the development of algorithms. Discover how these advancements paved the way for the Renaissance in Europe. |
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""" |
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``` |
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Generated Title-Paragraph Segmentation |
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```console |
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Block 1 |
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Ancient Foundations (3000 BCE - 600 CE) |
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Block 2 |
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----- |
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In the dawn of human civilization, mathematics emerged as an essential tool for commerce, construction, and astronomy. Explore the mathematical innovations of ancient cultures such as the Babylonians, Egyptians, and Greeks, laying the groundwork for numerical systems, geometry, and the Pythagorean theorem. |
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Block 3 |
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The Golden Age of Islamic Mathematics (700 CE - 1300 CE) |
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Block 4 |
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----- |
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Delve into the intellectual flourishing during the Islamic Golden Age, where scholars like Al-Khwarizmi and Omar Khayyam made groundbreaking contributions to algebra, trigonometry, and the development of algorithms. Discover how these advancements paved the way for the Renaissance in Europe. |
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``` |
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<!-- This section is for the model use without fine-tuning or plugging into a larger ecosystem/app. --> |
