tensorneko 0.1.8

A small package for PyTorch utils

TensorNeko

Tensor Neural Engine Kompanion. An util library based on PyTorch and PyTorch Lightning.

Install

pip install tensorneko

Neko Layers and Modules

Build an MLP with linear layers. The activation and normalization will be placed in the hidden layers.

784 -> 1024 -> 512 -> 10

import tensorneko as neko
import torch.nn

mlp = neko.module.MLP(
    neurons=[784, 1024, 512, 10],
    build_activation=torch.nn.ReLU,
    build_normalization=[
        lambda: torch.nn.BatchNorm1d(1024),
        lambda: torch.nn.BatchNorm1d(512)
    ],
    dropout_rate=0.5
)

Build a Conv2d with activation and normalization.

import tensorneko as neko
import torch.nn

conv2d = neko.layer.Conv2d(
    in_channels=256,
    out_channels=1024,
    kernel_size=(3, 3),
    padding=(1, 1),
    build_activation=torch.nn.ReLU,
    build_normalization=lambda: torch.nn.BatchNorm2d(256),
    normalization_after_activation=False
)

All modules and layers

layers:

• Concatenate
• Conv2d
• Linear
• Log
• PatchEmbedding2d
• PositionalEmbedding
• Reshape

modules:

• DenseBlock
• InceptionModule
• MLP
• ResidualBlock and ResidualModule
• AttentionModule, TransformerEncoderBlock and TransformerEncoder

Neko modules

All tensorneko.layer and tensorneko.module are NekoModule. They can be used in fn.py pipe operation.

from tensorneko.layer import Linear
from torch.nn import ReLU
import torch

linear0 = Linear(16, 128, build_activation=ReLU)
linear1 = Linear(128, 1)

f = linear0 >> linear1
print(f(torch.rand(16)).shape)
# torch.Size([1])

Neko reader

Easily load different modal data.

import tensorneko as neko

# read video (Temporal, Channel, Height, Width)
video_tensor = neko.io.read.video.of("path/to/video.mp4")
# read audio (Channel, Temporal)
audio_tensor = neko.io.read.audio.of("path/to/audio.wav")
# read image (Channel, Height, Width)
image_tensor = neko.io.read.audio.of("path/to/image.png")
# read text 
text_string = neko.io.read.text.of("path/to/text.txt")

Neko preprocessing

import tensorneko as neko

# A video tensor with (120, 3, 720, 1280)
video = neko.io.read.video.of("example/video.mp4")
# Get a resized tensor with (120, 3, 256, 256)
neko.preprocess.resize_video(video, (256, 256))

All preprocessing utils

• resize_video
• resize_image

Neko Model

Build and train a simple model for classifying MNIST with MLP.

from typing import Optional, Union, Sequence, Dict, List

import torch.nn
from torch import Tensor
from torch.optim import Adam
from torchmetrics import Accuracy
from pytorch_lightning.callbacks import ModelCheckpoint

import tensorneko as neko
from tensorneko.util import get_activation, get_loss


class MnistClassifier(neko.NekoModel):

    def __init__(self, name: str, mlp_neurons: List[int], activation: str, dropout_rate: float, loss: str,
        learning_rate: float, weight_decay: float
    ):
        super().__init__(name)
        self.weight_decay = weight_decay
        self.learning_rate = learning_rate

        self.flatten = torch.nn.Flatten()
        self.mlp = neko.module.MLP(
            neurons=mlp_neurons,
            build_activation=get_activation(activation),
            dropout_rate=dropout_rate
        )
        self.loss_func = get_loss(loss)()
        self.acc_func = Accuracy()

    def forward(self, x):
        # (batch, 28, 28)
        x = self.flatten(x)
        # (batch, 768)
        x = self.mlp(x)
        # (batch, 10)
        return x

    def training_step(self, batch: Optional[Union[Tensor, Sequence[Tensor]]] = None, batch_idx: Optional[int] = None,
        optimizer_idx: Optional[int] = None, hiddens: Optional[Tensor] = None
    ) -> Dict[str, Tensor]:
        x, y = batch
        logit = self(x)
        prob = logit.sigmoid()
        loss = self.loss_func(prob, y)
        acc = self.acc_func(prob.max(dim=1)[1], y)
        return {"loss": loss, "acc": acc}

    def validation_step(self, batch: Optional[Union[Tensor, Sequence[Tensor]]] = None, batch_idx: Optional[int] = None,
        dataloader_idx: Optional[int] = None
    ) -> Dict[str, Tensor]:
        x, y = batch
        logit = self(x)
        prob = logit.sigmoid()
        loss = self.loss_func(prob, y)
        acc = self.acc_func(prob.max(dim=1)[1], y)
        return {"loss": loss, "acc": acc}

    def predict_step(self, batch: Tensor, batch_idx: int, dataloader_idx: Optional[int] = None) -> Tensor:
        x, y = batch
        logit = self(x)
        return logit

    def configure_optimizers(self):
        optimizer = Adam(self.parameters(), lr=self.learning_rate, betas=(0.5, 0.9), weight_decay=self.weight_decay)
        return {
            "optimizer": optimizer
        }


model = MnistClassifier("mnist_mlp_classifier", [784, 1024, 512, 10], "ReLU", 0.5, "CrossEntropyLoss", 1e-4, 1e-4)

dm = ...  # The MNIST datamodule from PyTorch Lightning

trainer = neko.NekoTrainer(log_every_n_steps=0, gpus=1, logger=model.name, precision=32,
    checkpoint_callback=ModelCheckpoint(dirpath="./ckpt",
        save_last=True, filename=model.name + "-{epoch}-{val_acc:.3f}", monitor="val_acc", mode="max"
    ))

trainer.fit(model, dm)

Neko utilities

StringGetter: Get PyTorch class from string.

import tensorneko as neko
activation = neko.util.get_activation("leakyRelu")()

__: The arguments to pipe operator

from tensorneko.util import __, _
result = __(20) >> (_ + 1) >> (_ * 2) >> __.get
print(result)
# 42

Utilities list:

• reduce_dict_by
• summarize_dict_by
• generate_inf_seq
• compose
• listdir
• with_printed
• with_printed_shape
• is_bad_num
• ifelse
• dict_add
• count_parameters
• as_list
• Configuration
• get_activation
• get_loss
• __