| import os.path
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|
|
| import torch
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| import torch.nn as nn
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| from transformers import RobertaTokenizerFast, RobertaForMaskedLM
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| import streamlit as st
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|
|
|
|
| class SimpleClassifier(nn.Module):
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| def __init__(self, in_features: int, hidden_features: int,
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| out_features: int, activation=nn.ReLU()):
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| super().__init__()
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| self.bn = nn.BatchNorm1d(in_features)
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| self.in2hid = nn.Linear(in_features, hidden_features)
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| self.activation = activation
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| self.hid2hid = nn.Linear(hidden_features, hidden_features)
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| self.hid2out = nn.Linear(hidden_features, out_features)
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|
|
|
|
|
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| self.bn2 = nn.BatchNorm1d(hidden_features)
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|
|
| def forward(self, X):
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| X = self.bn(X)
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| X = self.in2hid(X)
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|
|
| X = self.activation(X)
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| X = self.hid2hid(torch.concat((X,), 1))
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|
|
| X = self.activation(X)
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| X = self.hid2out(torch.concat((X,), 1))
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|
|
| X = nn.functional.sigmoid(X)
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| return X
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|
|
|
|
| @st.cache_data()
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| def load_models():
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| model = RobertaForMaskedLM.from_pretrained("roberta-base")
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| model.lm_head = nn.Identity()
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| tokenizer = RobertaTokenizerFast.from_pretrained("roberta-base")
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| my_classifier = SimpleClassifier(768, 768, 1)
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| weights_path = os.path.join(__file__, "..", "twitter_model_91_5-.pth")
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| my_classifier.load_state_dict(torch.load(weights_path, map_location=device))
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| my_classifier.eval()
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| return {
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| "tokenizer": tokenizer,
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| "model": model,
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| "classifier": my_classifier
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| }
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|
|
|
|
| def classify_text(text: str) -> float:
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| models = load_models()
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| tokenizer, model, classifier = models["tokenizer"], models["model"], models["classifier"]
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|
|
| X = tokenizer(
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| text,
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| truncation=True,
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| max_length=128,
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| return_tensors='pt'
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| )["input_ids"]
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|
|
| X = model.forward(X)[-1][0].sum(axis=0)[None, :]
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| return classifier(X)
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|
|
|
|
| device = torch.device("cuda") if torch.cuda.is_available() else torch.device("cpu")
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|
|
