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wassname
178 lines
7.3 KiB
Python
178 lines
7.3 KiB
Python
import pytorch_lightning as pl
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import torch
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from torch import nn
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import torch.nn.functional as F
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import numpy as np
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from matplotlib import pyplot as plt
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from .utils import ObjectDict, agg_logs, round_values
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from .data.smart_meter import get_smartmeter_df, SmartMeterDataSet, collate_fns
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from .logger import logger
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from .plot import plot_from_loader, plot_from_loader_to_tensor
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class PL_Seq2Seq(pl.LightningModule):
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def __init__(self, hparams, loss_fn=F.mse_loss, num_workers=3, MODEL_CLS=None):
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super().__init__()
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self.hparams = ObjectDict()
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self.hparams.update(
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hparams.__dict__ if hasattr(hparams, "__dict__") else hparams
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)
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self.num_workers = num_workers
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self._model = MODEL_CLS(self.hparams)
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self._datasets = None
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self.loss_fn = loss_fn
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self.train_logs = [] # HACK
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self._dfs = None
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# TODO make label name configurable
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# TODO make data source configurable
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def forward(self, *args, **kwargs):
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return self._model(*args, **kwargs)
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def training_step(self, batch, batch_idx):
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# REQUIRED
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assert all(torch.isfinite(d).all() for d in batch)
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context_x, context_y, target_x, target_y = batch
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y_dist, losses, extra = self.forward(context_x, context_y, target_x, target_y)
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tensorboard_logs = {"train_" + k: v for k, v in losses.items()}
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assert torch.isfinite(tensorboard_logs["train_loss"])
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return {"loss": tensorboard_logs['train_loss'], "log": tensorboard_logs}
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def validation_step(self, batch, batch_idx):
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context_x, context_y, target_x, target_y = batch
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assert all(torch.isfinite(d).all() for d in batch)
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y_dist, losses, extra = self.forward(context_x, context_y, target_x, target_y)
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tensorboard_logs = {"val_" + k: v for k, v in losses.items()}
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assert torch.isfinite(tensorboard_logs["val_loss"])
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return {"val_loss": tensorboard_logs["val_loss"], "log": tensorboard_logs}
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def validation_end(self, outputs):
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if int(self.hparams["vis_i"]) > 0:
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self.show_image()
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outputs = agg_logs(outputs)
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# agg and print self.train_logs HACK https://github.com/PyTorchLightning/pytorch-lightning/issues/100
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train_outputs = agg_logs(self.train_logs)
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self.train_logs = []
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logger.info(f"val step={self.trainer.global_step}, val={round_values(outputs)} tain={round_values(train_outputs)}")
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# tensorboard_logs_str = {k: f"{v}" for k, v in tensorboard_logs.items()}
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# print(f"step {self.trainer.global_step}, {outputs}")
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return {"val_loss": outputs["agg_val_loss"], "train_loss": train_outputs.get("agg_train_loss", None), "log": {**train_outputs.get("log", {}), **outputs["log"]}}
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def show_image(self):
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# https://github.com/PytorchLightning/pytorch-lightning/blob/f8d9f8f/pytorch_lightning/core/lightning.py#L293
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loader = self.val_dataloader()
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vis_i = min(int(self.hparams["vis_i"]), len(loader.dataset))
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# print('vis_i', vis_i)
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if isinstance(self.hparams["vis_i"], str):
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image = plot_from_loader(loader, self, i=int(vis_i))
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plt.show()
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else:
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image = plot_from_loader_to_tensor(loader, self, i=vis_i)
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self.logger.experiment.add_image('val/image', image, self.trainer.global_step)
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def test_step(self, batch, batch_idx):
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pred, losses, extra = self.forward(*batch)
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context_x, context_y, target_x, target_y = batch
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y_dist = extra['y_dist']
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# For test use a -logp only
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loss = -y_dist.log_prob(target_y).mean()
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tensorboard_logs = {"test_" + k: v for k, v in losses.items()}
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tensorboard_logs["test_score"] = loss
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assert torch.isfinite(loss)
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return {"test_loss": loss, "log": tensorboard_logs}
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def test_end(self, outputs):
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outputs = agg_logs(outputs)
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logger.info(
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f"step {self.trainer.global_step}, {outputs}"
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)
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return {"test_loss": outputs["agg_test_loss"], "log": outputs["log"]}
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def configure_optimizers(self):
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optim = torch.optim.Adam(self.parameters(), lr=self.hparams["learning_rate"])
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scheduler = torch.optim.lr_scheduler.ReduceLROnPlateau(
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optim, patience=self.hparams["patience"], verbose=True, min_lr=1e-7
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)
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return [optim], [scheduler]
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def _get_cache_dfs(self):
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if self._dfs is None:
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df_train, df_val, df_test = get_smartmeter_df()
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self._dfs = dict(df_train=df_train, df_val=df_val, df_test=df_test)
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return self._dfs
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@pl.data_loader
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def train_dataloader(self):
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df_train = self._get_cache_dfs()['df_train']
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data_train = SmartMeterDataSet(
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df_train, self.hparams["num_context"], self.hparams["num_extra_target"]
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)
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# I want epochs to be about 5 mins of training data. That way earlystopping etc work
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sampler = None
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max_epoch_steps = self.hparams.get("max_epoch_steps", None)
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if max_epoch_steps is not None:
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inds = np.random.choice(np.arange(len(data_train)), max_epoch_steps)
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sampler = torch.utils.data.sampler.SubsetRandomSampler(inds)
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return torch.utils.data.DataLoader(
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data_train,
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batch_size=self.hparams["batch_size"],
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# shuffle=True,
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collate_fn=collate_fns(
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self.hparams["num_context"], self.hparams["num_extra_target"], sample=True, context_in_target=self.hparams["context_in_target"]
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),
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sampler=sampler,
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num_workers=self.hparams["num_workers"],
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)
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@pl.data_loader
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def val_dataloader(self):
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df_test = self._get_cache_dfs()['df_val']
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data_test = SmartMeterDataSet(
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df_test, self.hparams["num_context"], self.hparams["num_extra_target"]
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)
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sampler = None
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max_epoch_steps = self.hparams.get("max_epoch_steps", None)
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if max_epoch_steps is not None:
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sampler = torch.utils.data.sampler.SubsetRandomSampler(range(int(max_epoch_steps//10)))
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return torch.utils.data.DataLoader(
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data_test,
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batch_size=self.hparams["batch_size"],
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# shuffle=False,
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sampler=sampler,
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collate_fn=collate_fns(
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self.hparams["num_context"], self.hparams["num_extra_target"], sample=False, context_in_target=self.hparams["context_in_target"]
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),
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num_workers=self.hparams["num_workers"],
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)
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@pl.data_loader
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def test_dataloader(self):
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df_test = self._get_cache_dfs()['df_test']
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data_test = SmartMeterDataSet(
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df_test, self.hparams["num_context"], self.hparams["num_extra_target"]
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)
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max_epoch_steps = self.hparams.get("max_epoch_steps", None)
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if max_epoch_steps is not None:
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sampler = torch.utils.data.sampler.SubsetRandomSampler(range(int(max_epoch_steps//10)))
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return torch.utils.data.DataLoader(
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data_test,
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batch_size=self.hparams["batch_size"],
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# shuffle=False,
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collate_fn=collate_fns(
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self.hparams["num_context"], self.hparams["num_extra_target"], sample=False, context_in_target=self.hparams["context_in_target"]
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),
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sampler=sampler,
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num_workers=self.hparams["num_workers"],
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)
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