83 lines
3.1 KiB
Python
83 lines
3.1 KiB
Python
from typing import Any, Dict
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import torch
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from freqtrade.freqai.base_models.PyTorchModelTrainer import PyTorchModelTrainer
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from freqtrade.freqai.data_kitchen import FreqaiDataKitchen
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from freqtrade.freqai.prediction_models.PyTorchClassifier import PyTorchClassifier
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from freqtrade.freqai.prediction_models.PyTorchMLPModel import PyTorchMLPModel
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class PyTorchMLPClassifier(PyTorchClassifier):
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"""
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This class implements the fit method of IFreqaiModel.
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in the fit method we initialize the model and trainer objects.
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the only requirement from the model is to be aligned to PyTorchClassifier
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predict method that expects the model to predict tensor of type long.
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the trainer defines the training loop.
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parameters are passed via `model_training_parameters` under the freqai
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section in the config file. e.g:
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{
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...
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"freqai": {
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...
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"model_training_parameters" : {
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"learning_rate": 3e-4,
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"trainer_kwargs": {
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"max_iters": 5000,
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"batch_size": 64,
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"max_n_eval_batches": None,
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},
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"model_kwargs": {
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"hidden_dim": 512,
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"dropout_percent": 0.2,
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"n_layer": 1,
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},
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}
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}
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}
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"""
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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model_training_params = self.freqai_info.get("model_training_parameters", {})
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self.learning_rate: float = model_training_params.get("learning_rate", 3e-4)
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self.model_kwargs: Dict[str, any] = model_training_params.get("model_kwargs", {})
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self.trainer_kwargs: Dict[str, any] = model_training_params.get("trainer_kwargs", {})
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def fit(self, data_dictionary: Dict, dk: FreqaiDataKitchen, **kwargs) -> Any:
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"""
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User sets up the training and test data to fit their desired model here
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:param data_dictionary: the dictionary constructed by DataHandler to hold
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all the training and test data/labels.
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:raises ValueError: If self.class_names is not defined in the parent class.
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"""
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class_names = self.get_class_names()
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self.convert_label_column_to_int(data_dictionary, dk, class_names)
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n_features = data_dictionary["train_features"].shape[-1]
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model = PyTorchMLPModel(
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input_dim=n_features,
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output_dim=len(class_names),
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**self.model_kwargs
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)
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model.to(self.device)
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optimizer = torch.optim.AdamW(model.parameters(), lr=self.learning_rate)
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criterion = torch.nn.CrossEntropyLoss()
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init_model = self.get_init_model(dk.pair)
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trainer = PyTorchModelTrainer(
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model=model,
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optimizer=optimizer,
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criterion=criterion,
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model_meta_data={"class_names": class_names},
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device=self.device,
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init_model=init_model,
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target_tensor_type=torch.long,
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**self.trainer_kwargs,
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)
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trainer.fit(data_dictionary)
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return trainer
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