Tensor2Tensor
Tensor2Tensor, or
T2T for short, is a library
of deep learning models and datasets designed to make deep learning more
accessible and accelerate ML
research.
T2T was developed by researchers and engineers in the
Google Brain team and a community
of users. It is now deprecated — we keep it running and welcome
bug-fixes, but encourage users to use the successor library Trax.
Quick Start
This iPython notebook
explains T2T and runs in your browser using a free VM from Google,
no installation needed. Alternatively, here is a one-command version that
installs T2T, downloads MNIST, trains a model and evaluates it:
pip install tensor2tensor && t2t-trainer \
--generate_data \
--data_dir=~/t2t_data \
--output_dir=~/t2t_train/mnist \
--problem=image_mnist \
--model=shake_shake \
--hparams_set=shake_shake_quick \
--train_steps=1000 \
--eval_steps=100
Contents
Suggested Datasets and Models
Below we list a number of tasks that can be solved with T2T when
you train the appropriate model on the appropriate problem.
We give the problem and model below and we suggest a setting of
hyperparameters that we know works well in our setup. We usually
run either on Cloud TPUs or on 8-GPU machines; you might need
to modify the hyperparameters if you run on a different setup.
Mathematical Language Understanding
For evaluating mathematical expressions at the character level involving addition, subtraction and multiplication of both positive and negative decimal numbers with variable digits assigned to symbolic variables, use
- the MLU data-set:
--problem=algorithmic_math_two_variables
You can try solving the problem with different transformer models and hyperparameters as described in the paper:
- Standard transformer:
--model=transformer
--hparams_set=transformer_tiny
- Universal transformer:
--model=universal_transformer
--hparams_set=universal_transformer_tiny
- Adaptive universal transformer:
--model=universal_transformer
--hparams_set=adaptive_universal_transformer_tiny
Story, Question and Answer
For answering questions based on a story, use
- the bAbi data-set:
--problem=babi_qa_concat_task1_1k
You can choose the bAbi task from the range [1,20] and the subset from 1k or
10k. To combine test data from all tasks into a single test set, use
--problem=babi_qa_concat_all_tasks_10k
Image Classification
For image classification, we have a number of standard data-sets:
- ImageNet (a large data-set):
--problem=image_imagenet, or one
of the re-scaled versions (image_imagenet224, image_imagenet64,
image_imagenet32)
- CIFAR-10:
--problem=image_cifar10 (or
--problem=image_cifar10_plain to turn off data augmentation)
- CIFAR-100:
--problem=image_cifar100
- MNIST:
--problem=image_mnist
For ImageNet, we suggest to use the ResNet or Xception, i.e.,
use --model=resnet --hparams_set=resnet_50 or
--model=xception --hparams_set=xception_base.
Resnet should get to above 76% top-1 accuracy on ImageNet.
For CIFAR and MNIST, we suggest to try the shake-shake model:
--model=shake_shake --hparams_set=shakeshake_big.
This setting trained for --train_steps=700000 should yield
close to 97% accuracy on CIFAR-10.
Image Generation
For (un)conditional image generation, we have a number of standard data-sets:
- CelebA:
--problem=img2img_celeba for image-to-image translation, namely,
superresolution from 8x8 to 32x32.
- CelebA-HQ:
--problem=image_celeba256_rev for a downsampled 256x256.
- CIFAR-10:
--problem=image_cifar10_plain_gen_rev for class-conditional
32x32 generation.
- LSUN Bedrooms:
--problem=image_lsun_bedrooms_rev
- MS-COCO:
--problem=image_text_ms_coco_rev for text-to-image generation.
- Small ImageNet (a large data-set):
--problem=image_imagenet32_gen_rev for
32x32 or --problem=image_imagenet64_gen_rev for 64x64.
We suggest to use the Image Transformer, i.e., --model=imagetransformer, or
the Image Transformer Plus, i.e., --model=imagetransformerpp that uses
discretized mixture of logistics, or variational auto-encoder, i.e.,
--model=transformer_ae.
For CIFAR-10, using --hparams_set=imagetransformer_cifar10_base or
--hparams_set=imagetransformer_cifar10_base_dmol yields 2.90 bits per
dimension. For Imagenet-32, using
--hparams_set=imagetransformer_imagenet32_base yields 3.77 bits per dimension.
Language Modeling
For language modeling, we have these data-sets in T2T:
- PTB (a small data-set):
--problem=languagemodel_ptb10k for
word-level modeling and --problem=languagemodel_ptb_characters
for character-level modeling.
- LM1B (a billion-word corpus):
--problem=languagemodel_lm1b32k for
subword-level modeling and --problem=languagemodel_lm1b_characters
for character-level modeling.
We suggest to start with --model=transformer on this task and use
--hparams_set=transformer_small for PTB and
--hparams_set=transformer_base for LM1B.
Sentiment Analysis
For the task of recognizing the sentiment of a sentence, use
- the IMDB data-set:
--problem=sentiment_imdb
We suggest to use --model=transformer_encoder here and since it is
a small data-set, try --hparams_set=transformer_tiny and train for
few steps (e.g., --train_steps=2000).
Speech Recognition
For speech-to-text, we have these data-sets in T2T:
Librispeech (US English): --problem=librispeech for
the whole set and --problem=librispeech_clean for a smaller
but nicely filtered part.
Mozilla Common Voice (US English): --problem=common_voice for the whole set
--problem=common_voice_clean for a quality-checked subset.
Summarization
For summarizing longer text into shorter one we have these data-sets:
- CNN/DailyMail articles summarized into a few sentences:
--problem=summarize_cnn_dailymail32k
We suggest to use --model=transformer and
--hparams_set=transformer_prepend for this task.
This yields good ROUGE scores.
Translation
There are a number of translation data-sets in T2T:
- English-German:
--problem=translate_ende_wmt32k
- English-French:
--problem=translate_enfr_wmt32k
- English-Czech:
--problem=translate_encs_wmt32k
- English-Chinese:
--problem=translate_enzh_wmt32k
- English-Vietnamese:
--problem=translate_envi_iwslt32k
- English-Spanish:
--problem=translate_enes_wmt32k
You can get translations in the other direction by appending _rev to
the problem name, e.g., for German-English use
--problem=translate_ende_wmt32k_rev
(note that you still need to download the original data with t2t-datagen
--problem=translate_ende_wmt32k).
For all translation problems, we suggest to try the Transformer model:
--model=transformer. At first it is best to try the base setting,
--hparams_set=transformer_base. When trained on 8 GPUs for 300K steps
this should reach a BLEU score of about 28 on the English-German data-set,
which is close to state-of-the art. If training on a single GPU, try the
--hparams_set=transformer_base_single_gpu setting. For very good results
or larger data-sets (e.g., for English-French), try the big model
with --hparams_set=transformer_big.
See this example to know how the translation works.
Basics
Walkthrough
Here's a walkthrough training a good English-to-German translation
model using the Transformer model from Attention Is All You
Need on WMT data.
pip install tensor2tensor
# See what problems, models, and hyperparameter sets are available.
# You can easily swap between them (and add new ones).
t2t-trainer --registry_help
PROBLEM=translate_ende_wmt32k
MODEL=transformer
HPARAMS=transformer_base_single_gpu
DATA_DIR=$HOME/t2t_data
TMP_DIR=/tmp/t2t_datagen
TRAIN_DIR=$HOME/t2t_train/$PROBLEM/$MODEL-$HPARAMS
mkdir -p $DATA_DIR $TMP_DIR $TRAIN_DIR
# Generate data
t2t-datagen \
--data_dir=$DATA_DIR \
--tmp_dir=$TMP_DIR \
--problem=$PROBLEM
# Train
# * If you run out of memory, add --hparams='batch_size=1024'.
t2t-trainer \
--data_dir=$DATA_DIR \
--problem=$PROBLEM \
--model=$MODEL \
--hparams_set=$HPARAMS \
--output_dir=$TRAIN_DIR
# Decode
DECODE_FILE=$DATA_DIR/decode_this.txt
echo "Hello world" >> $DECODE_FILE
echo "Goodbye world" >> $DECODE_FILE
echo -e 'Hallo Welt\nAuf Wiedersehen Welt' > ref-translation.de
BEAM_SIZE=4
ALPHA=0.6
t2t-decoder \
--data_dir=$DATA_DIR \
--problem=$PROBLEM \
--model=$MODEL \
--hparams_set=$HPARAMS \
--output_dir=$TRAIN_DIR \
--decode_hparams="beam_size=$BEAM_SIZE,alpha=$ALPHA" \
--decode_from_file=$DECODE_FILE \
--decode_to_file=translation.en
# See the translations
cat translation.en
# Evaluate the BLEU score
# Note: Report this BLEU score in papers, not the internal approx_bleu metric.
t2t-bleu --translation=translation.en --reference=ref-translation.de
Installation
# Assumes tensorflow or tensorflow-gpu installed
pip install tensor2tensor
# Installs with tensorflow-gpu requirement
pip install tensor2tensor[tensorflow_gpu]
# Installs with tensorflow (cpu) requirement
pip install tensor2tensor[tensorflow]
Binaries:
# Data generator
t2t-datagen
# Trainer
t2t-trainer --registry_help
Library usage:
python -c "from tensor2tensor.models.transformer import Transformer"
Features
- Many state of the art and baseline models are built-in and new models can be
added easily (open an issue or pull request!).
- Many datasets across modalities - text, audio, image - available for
generation and use, and new ones can be added easily (open an issue or pull
request for public datasets!).
- Models can be used with any dataset and input mode (or even multiple); all
modality-specific processing (e.g. embedding lookups for text tokens) is done
with
bottom and top transformations, which are specified per-feature in the
model.
- Support for multi-GPU machines and synchronous (1 master, many workers) and
asynchronous (independent workers synchronizing through a parameter server)
distributed training.
- Easily swap amongst datasets and models by command-line flag with the data
generation script
t2t-datagen and the training script t2t-trainer.
- Train on Google Cloud ML and Cloud TPUs.
T2T overview
Problems
Problems consist of features such as inputs and targets, and metadata such
as each feature's modality (e.g. symbol, image, audio) and vocabularies. Problem
features are given by a dataset, which is stored as a TFRecord file with
tensorflow.Example protocol buffers. All
problems are imported in
all_problems.py
or are registered with @registry.register_problem. Run
t2t-datagen
to see the list of available problems and download them.
Models
T2TModels define the core tensor-to-tensor computation. They apply a
default transformation to each input and output so that models may deal with
modality-independent tensors (e.g. embeddings at the input; and a linear
transform at the output to produce logits for a softmax over classes). All
models are imported in the
models subpackage,
inherit from T2TModel,
and are registered with
@registry.register_model.
Hyperparameter Sets
Hyperparameter sets are encoded in
HParams
objects, and are registered with
@registry.register_hparams.
Every model and problem has a HParams. A basic set of hyperparameters are
defined in
common_hparams.py
and hyperparameter set functions can compose other hyperparameter set functions.
Trainer
The trainer binary is the entrypoint for training, evaluation, and
inference. Users can easily switch between problems, models, and hyperparameter
sets by using the --model, --problem, and --hparams_set flags. Specific
hyperparameters can be overridden with the --hparams flag. --schedule and
related flags control local and distributed training/evaluation
(distributed training documentation).
Adding your own components
T2T's components are registered using a central registration mechanism that
enables easily adding new ones and easily swapping amongst them by command-line
flag. You can add your own components without editing the T2T codebase by
specifying the --t2t_usr_dir flag in t2t-trainer.
You can do so for models, hyperparameter sets, modalities, and problems. Please
do submit a pull request if your component might be useful to others.
See the example_usr_dir
for an example user directory.
Adding a dataset
To add a new dataset, subclass
Problem
and register it with @registry.register_problem. See
TranslateEndeWmt8k
for an example. Also see the data generators
README.
Run on FloydHub
Click this button to open a Workspace on FloydHub. You can use the workspace to develop and test your code on a fully configured cloud GPU machine.
Tensor2Tensor comes preinstalled in the environment, you can simply open a Terminal and run your code.
# Test the quick-start on a Workspace's Terminal with this command
t2t-trainer \
--generate_data \
--data_dir=./t2t_data \
--output_dir=./t2t_train/mnist \
--problem=image_mnist \
--model=shake_shake \
--hparams_set=shake_shake_quick \
--train_steps=1000 \
--eval_steps=100
Note: Ensure compliance with the FloydHub Terms of Service.
Papers
When referencing Tensor2Tensor, please cite this
paper.
@article{tensor2tensor,
author = {Ashish Vaswani and Samy Bengio and Eugene Brevdo and
Francois Chollet and Aidan N. Gomez and Stephan Gouws and Llion Jones and
\L{}ukasz Kaiser and Nal Kalchbrenner and Niki Parmar and Ryan Sepassi and
Noam Shazeer and Jakob Uszkoreit},
title = {Tensor2Tensor for Neural Machine Translation},
journal = {CoRR},
volume = {abs/1803.07416},
year = {2018},
url = {http://arxiv.org/abs/1803.07416},
}
Tensor2Tensor was used to develop a number of state-of-the-art models
and deep learning methods. Here we list some papers that were based on T2T
from the start and benefited from its features and architecture in ways
described in the Google Research Blog post introducing
T2T.
NOTE: This is not an official Google product.
一套由 Google Brain 团队的研究人员和工程师打造的深度学习模型与数据集库，目的是让深度学习更容易上手，加快机器学习研究的速度。