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"""Callback for W&B."""
from typing import Callable, Dict, List, Optional, Type
import numpy as np
from training.trainer.callbacks import Callback
import wandb
import text_recognizer.datasets.transforms as transforms
from text_recognizer.models.base import Model
class WandbCallback(Callback):
"""A custom W&B metric logger for the trainer."""
def __init__(self, log_batch_frequency: int = None) -> None:
"""Short summary.
Args:
log_batch_frequency (int): If None, metrics will be logged every epoch.
If set to an integer, callback will log every metrics every log_batch_frequency.
"""
super().__init__()
self.log_batch_frequency = log_batch_frequency
def _on_batch_end(self, batch: int, logs: Dict) -> None:
if self.log_batch_frequency and batch % self.log_batch_frequency == 0:
wandb.log(logs, commit=True)
def on_train_batch_end(self, batch: int, logs: Optional[Dict] = None) -> None:
"""Logs training metrics."""
if logs is not None:
logs["lr"] = self.model.optimizer.param_groups[0]["lr"]
self._on_batch_end(batch, logs)
def on_validation_batch_end(self, batch: int, logs: Optional[Dict] = None) -> None:
"""Logs validation metrics."""
if logs is not None:
self._on_batch_end(batch, logs)
def on_epoch_end(self, epoch: int, logs: Dict) -> None:
"""Logs at epoch end."""
wandb.log(logs, commit=True)
class WandbImageLogger(Callback):
"""Custom W&B callback for image logging."""
def __init__(
self,
example_indices: Optional[List] = None,
num_examples: int = 4,
transform: Optional[bool] = None,
) -> None:
"""Initializes the WandbImageLogger with the model to train.
Args:
example_indices (Optional[List]): Indices for validation images. Defaults to None.
num_examples (int): Number of random samples to take if example_indices are not specified. Defaults to 4.
transform (Optional[Dict]): Use transform on image or not. Defaults to None.
"""
super().__init__()
self.caption = None
self.example_indices = example_indices
self.test_sample_indices = None
self.num_examples = num_examples
self.transform = (
self._configure_transform(transform) if transform is not None else None
)
def _configure_transform(self, transform: Dict) -> Callable:
args = transform["args"] or {}
return getattr(transforms, transform["type"])(**args)
def set_model(self, model: Type[Model]) -> None:
"""Sets the model and extracts validation images from the dataset."""
self.model = model
self.caption = "Validation Examples"
if self.example_indices is None:
self.example_indices = np.random.randint(
0, len(self.model.val_dataset), self.num_examples
)
self.images = self.model.val_dataset.dataset.data[self.example_indices]
self.targets = self.model.val_dataset.dataset.targets[self.example_indices]
self.targets = self.targets.tolist()
def on_test_begin(self) -> None:
"""Get samples from test dataset."""
self.caption = "Test Examples"
if self.test_sample_indices is None:
self.test_sample_indices = np.random.randint(
0, len(self.model.test_dataset), self.num_examples
)
self.images = self.model.test_dataset.data[self.test_sample_indices]
self.targets = self.model.test_dataset.targets[self.test_sample_indices]
self.targets = self.targets.tolist()
def on_test_end(self) -> None:
"""Log test images."""
self.on_epoch_end(0, {})
def on_epoch_end(self, epoch: int, logs: Dict) -> None:
"""Get network predictions on validation images."""
images = []
for i, image in enumerate(self.images):
image = self.transform(image) if self.transform is not None else image
pred, conf = self.model.predict_on_image(image)
if isinstance(self.targets[i], list):
ground_truth = "".join(
[
self.model.mapper(int(target_index) - 26)
if target_index > 35
else self.model.mapper(int(target_index))
for target_index in self.targets[i]
]
).rstrip("_")
else:
ground_truth = self.model.mapper(int(self.targets[i]))
caption = f"Prediction: {pred} Confidence: {conf:.3f} Ground Truth: {ground_truth}"
images.append(wandb.Image(image, caption=caption))
wandb.log({f"{self.caption}": images}, commit=False)
class WandbSegmentationLogger(Callback):
"""Custom W&B callback for image logging."""
def __init__(
self,
class_labels: Dict,
example_indices: Optional[List] = None,
num_examples: int = 4,
) -> None:
"""Initializes the WandbImageLogger with the model to train.
Args:
class_labels (Dict): A dict with int as key and class string as value.
example_indices (Optional[List]): Indices for validation images. Defaults to None.
num_examples (int): Number of random samples to take if example_indices are not specified. Defaults to 4.
"""
super().__init__()
self.caption = None
self.class_labels = {int(k): v for k, v in class_labels.items()}
self.example_indices = example_indices
self.test_sample_indices = None
self.num_examples = num_examples
def set_model(self, model: Type[Model]) -> None:
"""Sets the model and extracts validation images from the dataset."""
self.model = model
self.caption = "Validation Segmentation Examples"
if self.example_indices is None:
self.example_indices = np.random.randint(
0, len(self.model.val_dataset), self.num_examples
)
self.images = self.model.val_dataset.dataset.data[self.example_indices]
self.targets = self.model.val_dataset.dataset.targets[self.example_indices]
self.targets = self.targets.tolist()
def on_test_begin(self) -> None:
"""Get samples from test dataset."""
self.caption = "Test Segmentation Examples"
if self.test_sample_indices is None:
self.test_sample_indices = np.random.randint(
0, len(self.model.test_dataset), self.num_examples
)
self.images = self.model.test_dataset.data[self.test_sample_indices]
self.targets = self.model.test_dataset.targets[self.test_sample_indices]
self.targets = self.targets.tolist()
def on_test_end(self) -> None:
"""Log test images."""
self.on_epoch_end(0, {})
def on_epoch_end(self, epoch: int, logs: Dict) -> None:
"""Get network predictions on validation images."""
images = []
for i, image in enumerate(self.images):
pred_mask = (
self.model.predict_on_image(image).detach().squeeze(0).cpu().numpy()
)
gt_mask = np.array(self.targets[i])
images.append(
wandb.Image(
image,
masks={
"predictions": {
"mask_data": pred_mask,
"class_labels": self.class_labels,
},
"ground_truth": {
"mask_data": gt_mask,
"class_labels": self.class_labels,
},
},
)
)
wandb.log({f"{self.caption}": images}, commit=False)
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