Added Transformer support
This commit is contained in:
@@ -1,4 +1,6 @@
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from typing import Tuple, Callable
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from typing import Tuple, Callable, Optional
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import re
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from html import unescape
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import torch
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from torch.utils.data import Dataset
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from datasets import load_dataset # Hugging Face (not PyTorch)
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@@ -15,7 +17,8 @@ class HfDatasetWithTokenEncode(Dataset):
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split: str,
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sample_field_name: str = "text",
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label_field_name: str = "label",
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encode: Callable=None) -> None:
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encode: Optional[Callable]=None,
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remove_html_tags:Optional[bool]=False) -> None:
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"""
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Initializes the dataset by loading Hugging Face dataset.
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@@ -24,12 +27,14 @@ class HfDatasetWithTokenEncode(Dataset):
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split (str): The dataset split (e.g., 'train').
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sample_field_name (str): Field name for text samples.
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label_field_name (str): Field name for labels.
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encode (Callable): Token encode function
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encode (Optional[Callable]): Token encode function
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remove_html_tags (Optional[bool]): Remove html tags in text if True.
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"""
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self.dataset = load_dataset(dataset_name, split=split)
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self.sample_field_name = sample_field_name
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self.label_field_name = label_field_name
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self.encode = encode
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self.remove_html_tags = remove_html_tags
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def __getitem__(self, idx: int) -> Tuple[torch.Tensor, torch.Tensor]:
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@@ -46,7 +51,21 @@ class HfDatasetWithTokenEncode(Dataset):
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"""
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# Get a text sample from database and convert to a word embedding
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sample = self.dataset[idx]
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tokens, masks = self.encode(sample[self.sample_field_name])
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if self.remove_html_tags:
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# Decode HTML entities like "&", "<", etc. to their actual characters
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text = unescape(sample[self.sample_field_name])
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# Remove HTML tags (like <br />, <p>, etc.)
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# The regex "<.*?>" uses .*? (non-greedy match) to ensure it matches one tag at a time,
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# instead of greedily removing everything between the first '<' and last '>'
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text = re.sub(r"<.*?>", " ", text)
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# Replace consecutive white space to a single white space
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text = re.sub(r" +", " ", text)
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else:
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text = sample[self.sample_field_name]
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tokens, masks = self.encode(text)
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# Get a corresponding label
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label = torch.tensor(sample[self.label_field_name], dtype=torch.long)
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@@ -0,0 +1,231 @@
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import os
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import sys
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from typing import Any, Dict, Optional, Tuple, Union
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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 sklearn.metrics import accuracy_score
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class PtTrainClassificationTransformerModel:
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"""
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Trains a classification Transformer model using a given dataset, loss function, optimizer, and number of epochs with learning rate decay.
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Args:
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model (PTMODEL): The PyTorch model to be trained.
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train_loader (torch.utils.data.DataLoader): DataLoader containing the training dataset.
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optimizer (PTOPTIMIZER): Optimizer used for training.
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loss (PTLOSS): The loss class.
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epochs (int): Number of training epochs.
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use_gpu (bool): Whether to use GPU for training.
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early_stopping (bool): Whether to turn on early stopping
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early_stopping_rounds (int): Specifies the number of rounds to monitor the evaluation loss when early_stopping is enabled and validation data is specified. If the loss does not decrease compared to the current best loss within this period, training will be stopped.
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output_best_val_model (bool): Whether to outputs the model with the best val loss or the model from the last epoch.
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classification_metrics (bool): If True and if val_loader is set, print out classification metrics. This is only valid for classification model training.
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val_loader (PTDATALOADER): DataLoader for validation dataset (optional).
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scheduler (PTLRSCHEDULER): Learning rate scheduler.
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category: PyTorch wrapper - Training
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"""
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@classmethod
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def INPUT_TYPES(cls) -> Dict[str, Any]:
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"""
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Defines the input types required for training the model.
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Returns:
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Dict[str, Any]: A dictionary specifying required and optional input types.
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"""
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return {
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"required": {
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"model": ("PTMODEL", {}),
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"train_loader": ("PTDATALOADER", {}),
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"optimizer": ("PTOPTIMIZER", {}),
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"loss_function": ("PTLOSS", {}),
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"epochs": ("INT", {"default":1, "min":1, "max":1e6}),
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"use_gpu": ("BOOLEAN", {"default":False}),
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"early_stopping": ("BOOLEAN", {"default":False}),
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"early_stopping_rounds": ("INT", {"default":10, "min":1, "max":1000}),
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"output_best_val_model": ("BOOLEAN", {"default":True}),
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"classification_metrics": ("BOOLEAN", {"default":True})
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},
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"optional": {
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"scheduler": ("PTLRSCHEDULER", {}),
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"val_loader": ("PTDATALOADER", {})
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}
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}
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RETURN_NAMES: tuple = ("Model", "train loss", "val loss")
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RETURN_TYPES: tuple = ("PTMODEL","TENSOR","TENSOR")
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FUNCTION: str = "f"
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CATEGORY: str = "Training"
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@classmethod
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def IS_CHANGED(cls, **kw):
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return float("NaN")
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def f(self,
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model: nn.Module,
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train_loader: torch.utils.data.DataLoader,
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optimizer: torch.optim.Optimizer,
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loss_function: nn.Module,
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epochs: int,
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use_gpu: bool,
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early_stopping: bool,
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early_stopping_rounds: int,
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output_best_val_model:bool,
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classification_metrics:bool,
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scheduler: Optional[Union[torch.optim.lr_scheduler._LRScheduler, torch.optim.lr_scheduler.ReduceLROnPlateau]] = None,
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val_loader: Optional[torch.utils.data.DataLoader] = None) -> Tuple[nn.Module, torch.Tensor, torch.Tensor]:
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"""
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Trains an Transformer model.
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Args:
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model (torch.nn.Module): The PyTorch model to be trained.
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train_loader (torch.utils.data.DataLoader): DataLoader containing the training dataset.
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optimizer (torch.optim.Optimizer): Optimizer used for training.
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loss (torch.nn.Module): The loss class.
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epochs (int): Number of training epochs.
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use_gpu (bool): Whether to use GPU for training.
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early_stopping (bool): Whether to turn on early stopping
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early_stopping_rounds (int): Specifies the number of rounds to monitor the evaluation loss when early_stopping is enabled and validation data is specified. If the loss does not decrease compared to the current best loss within this period, training will be stopped.
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output_best_val_model (bool): Whether to outputs the model with the best val loss or the model from the last epoch.
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classification_metrics (bool): If True and if val_loader is set, print out classification metrics. This is only valid for classification model training.
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val_loader (Optional[torch.utils.data.DataLoader]): DataLoader for validation dataset (optional).
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scheduler (Optional[Union[torch.optim.lr_scheduler._LRScheduler, torch.optim.lr_scheduler.ReduceLROnPlateau]]): Learning rate scheduler.
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Returns:
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Tuple[torch.nn.Module, torch.Tensor, torch.Tensor]: A tuple containing the trained model,
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training loss history, and validation loss history.
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"""
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if (scheduler is not None and
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isinstance(scheduler, torch.optim.lr_scheduler.ReduceLROnPlateau) and
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val_loader is None):
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raise ValueError("Validation data loader needs to be specified when ReduceLROnPlateau scheduler is specified.")
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checkpoint_dir = os.path.realpath(
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os.path.join(os.path.dirname(__file__), "..", "..", "models", "tmp"))
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print(f"Checkpoint tmp directory is set to {checkpoint_dir}")
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if os.path.exists(checkpoint_dir) is False:
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os.makedirs(checkpoint_dir)
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print(f"Created {checkpoint_dir}")
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best_checkpoint_path = os.path.join(checkpoint_dir, "best_model.pt")
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best_val_loss = None
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rounds_since_best_val_loss = 0
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all_preds = []
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all_labels = []
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with torch.inference_mode(False):
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train_loss = []
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val_loss = []
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if use_gpu:
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model.to("cuda")
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# Train the model
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for epoch in range(epochs):
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model.train()
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total_loss = 0
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total_samples = len(train_loader.dataset)
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for x, y in train_loader:
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if use_gpu:
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if isinstance(x, list):
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x = [e.to("cuda") for e in x]
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else:
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x = x.to("cuda")
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y = y.to("cuda")
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optimizer.zero_grad()
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y_hat = model(x)
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if y.dim() == 1:
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y = torch.unsqueeze(y, dim=-1)
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y = y.to(torch.float32)
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loss = loss_function(y_hat, y)
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loss.backward()
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optimizer.step()
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batch_size = y.size(0)
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batch_loss = loss.item() * batch_size
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total_loss += batch_loss
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epoch_loss = total_loss / total_samples
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print(f"Epoch (train) {epoch+1}/{epochs}, Loss: {epoch_loss:.4f}")
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train_loss.append(epoch_loss)
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if val_loader:
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with torch.no_grad():
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model.train(False) # TODO: Change to model.*e*v*a*l() once Comfy's security checker is fixed.
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total_loss = 0
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total_samples = len(val_loader.dataset)
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for x, y in val_loader:
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if use_gpu:
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if isinstance(x, list):
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x = [e.to("cuda") for e in x]
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else:
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x = x.to("cuda")
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y = y.to("cuda")
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y_hat = model(x)
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if y.dim() == 1:
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y = torch.unsqueeze(y, dim=-1)
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y = y.to(torch.float32)
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loss = loss_function(y_hat, y)
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batch_size = y.size(0)
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batch_loss = loss.item() * batch_size
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total_loss += batch_loss
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if classification_metrics and y.squeeze().dim() == 1 :
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# Accuracy collection for binary classification
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preds = (y_hat > 0.5).int().detach().cpu().numpy()
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labels = y.int().detach().cpu().numpy()
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all_preds.extend(preds)
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all_labels.extend(labels)
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epoch_loss = total_loss / total_samples
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print(f"Epoch (val) {epoch+1}/{epochs}, Loss: {epoch_loss:.4f}")
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val_loss.append(epoch_loss)
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if classification_metrics:
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if len(all_labels):
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# Compute accuracy
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acc = accuracy_score(all_labels, all_preds)
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print(f"Validation Accuracy: {acc:.4f}")
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else:
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print("Accuracy was not computed as the label is not scalar.")
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if best_val_loss is None or epoch_loss < best_val_loss:
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best_val_loss = epoch_loss
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rounds_since_best_val_loss = 0
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torch.save(model.state_dict(), best_checkpoint_path)
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print(f"Updated best val loss. Saved the model as {best_checkpoint_path}")
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else:
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rounds_since_best_val_loss += 1
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if early_stopping:
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if rounds_since_best_val_loss >= early_stopping_rounds:
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print(f"Val loss did not improve in {early_stopping_rounds} rounds. Stopping training.")
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break
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if scheduler:
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if isinstance(scheduler, torch.optim.lr_scheduler.ReduceLROnPlateau):
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scheduler.step(epoch_loss)
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else:
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scheduler.step()
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if use_gpu:
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model.to("cpu")
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if val_loader:
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if epoch_loss > best_val_loss and output_best_val_model:
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sd = torch.load(best_checkpoint_path, weights_only=True)
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model.load_state_dict(sd)
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print("Loaded the best model for output")
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else:
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print("Using the final epoch model for output.")
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return (model,
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torch.tensor(train_loss, dtype=torch.float32),
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torch.tensor(val_loss, dtype=torch.float32))
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@@ -0,0 +1,251 @@
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from typing import Any, Dict, Tuple, Union, Callable, Optional
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import torch
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import torch.nn as nn
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import torch
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import torch.nn as nn
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from typing import Tuple, Union, Callable
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class EmbeddingTransformerLinear(nn.Module):
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"""
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A Transformer encoder-based classification model with a linear output layer.
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This module uses a standard PyTorch TransformerEncoder, followed by masked mean pooling
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and a linear layer applied to the pooled representation.
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Args:
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num_layers (int): Number of encoder layers.
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vocabulary_size (int): Vocabulary size of the tokens.
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hidden_size (int): Hidden size (d_model) of the Transformer.
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nhead (int): Number of attention heads.
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dim_feedforward (int): Feedforward dimension.
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dropout (float): Dropout rate.
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nonlinearity (str): Activation function ('relu' or 'gelu').
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layer_norm_eps (float): Epsilon for layer normalization.
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batch_first (bool): Input shape format: True for (B, Seq, Feature), False for (Seq, B, Feature).
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norm_first (bool): Whether normalization comes before sublayers.
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bias (bool): Use bias in Transformer layers.
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max_length (int): The maximum sequence length used for allocating the positional embedding. This value is not passed to the Transformer itself.
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linear_output_size (int): Size of linear layer output.
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linear_bias (bool): Use bias in linear layer.
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pragma: skip_doc
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"""
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def __init__(self,
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num_encoder_layers: int,
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vocabulary_size: int,
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d_model: int,
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nhead: int,
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dim_feedforward: int,
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dropout: float,
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activation: Union[str, Callable[[torch.Tensor], torch.Tensor]],
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layer_norm_eps: float,
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batch_first: bool,
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norm_first: bool,
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bias: bool,
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max_length: int,
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linear_output_size: int,
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linear_bias: bool
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):
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super().__init__()
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self.batch_first = batch_first
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self.word_embedding = nn.Embedding(vocabulary_size, d_model)
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self.positional_embedding = nn.Embedding(max_length, d_model)
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# FIX: Allocate position_ids buffer once to avoid reallocation in each forward pass
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# self.register_buffer("position_ids_buffer", torch.arange(max_length)) # (max_length,)
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# FIX: use preallocated position_ids_buffer
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# position_ids = self.position_ids_buffer[:seq_len].unsqueeze(0).expand(batch_size, -1) # (B, T)
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self.position_ids = torch.arange(max_length)
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encoder_layer = nn.TransformerEncoderLayer(
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d_model=d_model,
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nhead=nhead,
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dim_feedforward=dim_feedforward,
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dropout=dropout,
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activation=activation,
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layer_norm_eps=layer_norm_eps,
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batch_first=batch_first,
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norm_first=norm_first,
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bias=bias
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)
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self.encoder = nn.TransformerEncoder(
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encoder_layer=encoder_layer,
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num_layers=num_encoder_layers
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)
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self.linear_model = nn.Linear(
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in_features=d_model,
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out_features=linear_output_size,
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bias=linear_bias
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)
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torch.nn.init.xavier_uniform_(self.linear_model.weight)
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def forward(self, inputs: Tuple[torch.Tensor, torch.Tensor]) -> torch.Tensor:
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"""
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Forward pass through the Transformer encoder and linear layer.
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Args:
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inputs (Tuple[torch.Tensor, torch.Tensor]):
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tokens: (B, T) token IDs,
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masks: (B, T) attention mask (1 = keep, 0 = pad)
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Returns:
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torch.Tensor: Output of the linear layer (B, linear_output_size)
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"""
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tokens, masks = inputs # (B, Tokens), (B, Tokens)
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if tokens.dim() != 2:
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raise ValueError(f"tokens with rank {tokens.dim()} was passed.")
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if masks.dim() != 2:
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raise ValueError(f"masks with rank {tokens.dim()} was passed.")
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if tokens.size() != masks.size():
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raise ValueError(f"tokens size masks size do not match.")
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batch_size, seq_len = tokens.size()
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token_embeds = self.word_embedding(tokens)
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position_ids_repeated = self.position_ids[:seq_len].repeat(batch_size, 1).to(token_embeds.device)
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positional_embeds = self.positional_embedding(position_ids_repeated)
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if token_embeds.size() != positional_embeds.size():
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raise ValueError("token_embeds & positional_embeds size mismatch.")
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x = token_embeds + positional_embeds # (B, Seq, Feature)
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if not self.batch_first:
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x = x.transpose(0, 1) # (Seq, B, Feature)
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x = self.encoder(
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x,
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src_key_padding_mask=~masks.bool() # (B, Seq)
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)
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if not self.batch_first:
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x = x.transpose(0, 1) # (B, Seq, Feature)
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# FIX: More memory-efficient masked mean pooling
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mask = masks.float() # (B, Seq)
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x = (x * mask.unsqueeze(-1)).sum(dim=1) / mask.sum(dim=1, keepdim=True).clamp(min=1e-9) # (B, Feature)
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outputs = self.linear_model(x) # (B, linear_output_size)
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return outputs
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class PtnEmbeddingTransformerLinear:
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"""
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A Transformer encoder model with a linear head.
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Args:
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num_layers (int): Number of encoder layers in Transformer.
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vocabulary_size (int): The vocabulary size of the tokens.
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hidden_size (int): Hidden dimension (d_model) for each token of the Transformer.
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nhead (int): Number of attention heads.
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dim_feedforward (int): Feedforward dimension.
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dropout (float): Dropout rate for Transformer layers.
|
||||
nonlinearity (str): Activation function ('relu' or 'gelu') used in Transformer layers.
|
||||
layer_norm_eps (float): Epsilon value for layer normalization.
|
||||
batch_first (bool): Input shape format: True for (B, Seq, Feature), False for (Seq, B, Feature).
|
||||
norm_first (bool): Whether to apply normalization before attention/feedforward.
|
||||
bias (bool): Use bias in the Transformer layers.
|
||||
max_length (int): Maximum input sequence length (for positional embedding).
|
||||
linear_output_size (int): Output size of the final linear layer.
|
||||
linear_bias (bool): Use bias in the linear layer.
|
||||
|
||||
category: PyTorch wrapper - Model
|
||||
"""
|
||||
|
||||
@classmethod
|
||||
def INPUT_TYPES(cls) -> Dict[str, Any]:
|
||||
"""
|
||||
Defines the input types for the function.
|
||||
|
||||
Returns:
|
||||
Dict[str, Any]: A dictionary specifying required input types.
|
||||
"""
|
||||
return {
|
||||
"required": {
|
||||
"num_layers": ("INT", {"default": 6, "min": 1, "max": 256}),
|
||||
"vocabulary_size": ("INT", {"default": 10000, "min": 1, "max": 1e6}),
|
||||
"hidden_size": ("INT", {"default": 512, "min": 1, "max": 1e6}),
|
||||
"nhead": ("INT", {"default": 8, "min": 1, "max": 32}),
|
||||
"dim_feedforward": ("INT", {"default": 2048, "min": 1, "max": 1e6}),
|
||||
"dropout": ("FLOAT", {"default": 0.1, "min": 0, "max": 1}),
|
||||
"nonlinearity": (("gelu", "relu"),),
|
||||
"layer_norm_eps": ("FLOAT", {"default": 1e-5, "min": 1e-9, "max": 1e-1, "step": 1e-9}),
|
||||
"batch_first": ("BOOLEAN", {"default": True}),
|
||||
"norm_first": ("BOOLEAN", {"default": False}),
|
||||
"bias": ("BOOLEAN", {"default": True}),
|
||||
"max_length": ("INT", {"default": 512, "min": 1, "max": 1e6}),
|
||||
"linear_output_size": ("INT", {"default": 1, "min": 1, "max": 1e6}),
|
||||
"linear_bias": ("BOOLEAN", {"default": True}),
|
||||
}
|
||||
}
|
||||
|
||||
RETURN_TYPES: Tuple[str] = ("PTMODEL",)
|
||||
FUNCTION: str = "f"
|
||||
CATEGORY: str = "Training"
|
||||
|
||||
@classmethod
|
||||
def IS_CHANGED(cls, **kw):
|
||||
return float("NaN")
|
||||
|
||||
def f(self,
|
||||
num_layers: int,
|
||||
vocabulary_size: int,
|
||||
hidden_size: int,
|
||||
nhead: int,
|
||||
dim_feedforward: int,
|
||||
dropout: float,
|
||||
nonlinearity: str,
|
||||
layer_norm_eps: float,
|
||||
batch_first: bool,
|
||||
norm_first: bool,
|
||||
bias: bool,
|
||||
max_length: int,
|
||||
linear_output_size: int,
|
||||
linear_bias: bool
|
||||
) -> Tuple[nn.Module]:
|
||||
"""
|
||||
Constructs a Transformer model with a linear output layer.
|
||||
|
||||
Args:
|
||||
num_layers (int): Number of encoder layers.
|
||||
vocabulary_size (int): Vocabulary size of the tokens.
|
||||
hidden_size (int): Hidden size (d_model) of the Transformer.
|
||||
nhead (int): Number of attention heads.
|
||||
dim_feedforward (int): Feedforward dimension.
|
||||
dropout (float): Dropout rate.
|
||||
nonlinearity (str): Activation function ('relu' or 'gelu').
|
||||
layer_norm_eps (float): Epsilon for layer normalization.
|
||||
batch_first (bool): Input shape format: True for (B, Seq, Feature), False for (Seq, B, Feature).
|
||||
norm_first (bool): Whether normalization comes before sublayers.
|
||||
bias (bool): Use bias in Transformer layers.
|
||||
max_length (int): Maximum sequence length.
|
||||
linear_output_size (int): Size of linear layer output.
|
||||
linear_bias (bool): Use bias in linear layer.
|
||||
|
||||
Returns:
|
||||
Tuple[nn.Module]: A tuple containing the instantiated PyTorch model.
|
||||
"""
|
||||
with torch.inference_mode(False):
|
||||
model = EmbeddingTransformerLinear(
|
||||
num_encoder_layers=num_layers,
|
||||
vocabulary_size=vocabulary_size,
|
||||
d_model=hidden_size,
|
||||
nhead=nhead,
|
||||
dim_feedforward=dim_feedforward,
|
||||
dropout=dropout,
|
||||
activation=nonlinearity,
|
||||
layer_norm_eps=layer_norm_eps,
|
||||
batch_first=batch_first,
|
||||
norm_first=norm_first,
|
||||
bias=bias,
|
||||
max_length=max_length,
|
||||
linear_output_size=linear_output_size,
|
||||
linear_bias=linear_bias
|
||||
)
|
||||
return (model,)
|
||||
|
||||
@@ -54,7 +54,7 @@ class PtoLrSchedulerCosineAnnealing:
|
||||
"required": {
|
||||
"optimizer": ("PTOPTIMIZER", {}),
|
||||
"num_epochs": ("INT", {"default": 10, "min": 1, "max": int(1e8)}),
|
||||
"minimum_lr": ("FLOAT", {"default": 0, "min": 0, "max": 1.0, "step": 1e-8}),
|
||||
"minimum_lr": ("FLOAT", {"default": 0, "min": 0, "max": 1.0, "step": 1e-9}),
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@@ -12,6 +12,7 @@ class PtvHfDatasetWithTokenEncode:
|
||||
sample_field_name (str): Field name for text samples.
|
||||
label_field_name (str): Field name for labels.
|
||||
encode (PTCALLABLE): The reference to a token encoder function.
|
||||
remove_html_tags (bool): Remove html tags in text if True.
|
||||
|
||||
category: PyTorch wrapper - Training
|
||||
"""
|
||||
@@ -31,6 +32,7 @@ class PtvHfDatasetWithTokenEncode:
|
||||
"sample_field_name": ("STRING", {"default": "text","multiline": False}),
|
||||
"label_field_name": ("STRING", {"default": "label","multiline": False}),
|
||||
"encode": ("PTCALLABLE", {}),
|
||||
"remove_html_tags": ("BOOLEAN", {"default": False}),
|
||||
}
|
||||
}
|
||||
|
||||
@@ -47,7 +49,8 @@ class PtvHfDatasetWithTokenEncode:
|
||||
split: str,
|
||||
sample_field_name: str,
|
||||
label_field_name: str,
|
||||
encode: Callable) -> Tuple:
|
||||
encode: Callable,
|
||||
remove_html_tags:bool) -> Tuple:
|
||||
"""
|
||||
Loads a dataset from Hugging Face with specified parameters.
|
||||
|
||||
@@ -57,6 +60,7 @@ class PtvHfDatasetWithTokenEncode:
|
||||
sample_field_name (str): Field name for text samples.
|
||||
label_field_name (str): Field name for labels.
|
||||
encode (Callable): The reference to a token encoder function.
|
||||
remove_html_tags (bool): Remove html tags in text if True.
|
||||
|
||||
Returns:
|
||||
Tuple: A tuple containing the dataset instance.
|
||||
@@ -71,5 +75,6 @@ class PtvHfDatasetWithTokenEncode:
|
||||
split=split,
|
||||
sample_field_name=sample_field_name,
|
||||
label_field_name=label_field_name,
|
||||
encode=encode)
|
||||
encode=encode,
|
||||
remove_html_tags=remove_html_tags)
|
||||
return (dc,)
|
||||
|
||||
Reference in New Issue
Block a user