TensorNets

High level network definitions with pre-trained weights in TensorFlow (tested with >= 1.1.0).

Guiding principles

Applicability. Many people already have their own ML workflows, and want to put a new model on their workflows. TensorNets can be easily plugged together because it is designed as simple functional interfaces without custom classes.
Manageability. Models are written in tf.contrib.layers, which is lightweight like PyTorch and Keras, and allows for ease of accessibility to every weight and end-point. Also, it is easy to deploy and expand a collection of pre-processing and pre-trained weights.
Readability. With recent TensorFlow APIs, more factoring and less indenting can be possible. For example, all the inception variants are implemented as about 500 lines of code in TensorNets while 2000+ lines in official TensorFlow models.
Reproducibility. You can always reproduce the original results with simple APIs including feature extractions. Furthermore, you don't need to care about a version of TensorFlow beacuse compatibilities with various releases of TensorFlow have been checked with Travis.

Installation

You can install TensorNets from PyPI (pip install tensornets) or directly from GitHub (pip install git+https://github.com/taehoonlee/tensornets.git).

A quick example

Each network (see full list) is not a custom class but a function that takes and returns tf.Tensor as its input and output. Here is an example of ResNet50:

import tensorflow as tf
import tensornets as nets

inputs = tf.placeholder(tf.float32, [None, 224, 224, 3])
model = nets.ResNet50(inputs)

assert isinstance(model, tf.Tensor)

You can load an example image by using utils.load_img returning a np.ndarray as the NHWC format:

img = nets.utils.load_img('cat.png', target_size=256, crop_size=224)
assert img.shape == (1, 224, 224, 3)

Once your network is created, you can run with regular TensorFlow APIs 😊 because all the networks in TensorNets always return tf.Tensor. Using pre-trained weights and pre-processing are as easy as pretrained() and preprocess() to reproduce the original results:

with tf.Session() as sess:
    img = model.preprocess(img)  # equivalent to img = nets.preprocess(model, img)
    sess.run(model.pretrained())  # equivalent to nets.pretrained(model)
    preds = sess.run(model, {inputs: img})

You can see the most probable classes:

print(nets.utils.decode_predictions(preds, top=2)[0])
[(u'n02124075', u'Egyptian_cat', 0.28067636), (u'n02127052', u'lynx', 0.16826575)]

You can also easily obtain values of intermediate layers with get_middles() and get_outputs():

with tf.Session() as sess:
    img = model.preprocess(img)
    sess.run(model.pretrained())
    middles = sess.run(model.get_middles(), {inputs: img})
    outputs = sess.run(model.get_outputs(), {inputs: img})

model.print_middles()
assert middles[0].shape == (1, 56, 56, 256)
assert middles[-1].shape == (1, 7, 7, 2048)

model.print_outputs()
assert sum(sum((outputs[-1] - preds) ** 2)) < 1e-8

TensorNets enables us to deploy well-known architectures and benchmark those results faster ⚡️. For more information, you can check out the lists of utilities, examples, and architectures.

Object detection example

Each object detection model can be coupled with any network in TensorNets (see performance) and takes two arguments: a placeholder and a function acting as a stem layer. Here is an example of YOLOv2 for PASCAL VOC:

import tensorflow as tf
import tensornets as nets

inputs = tf.placeholder(tf.float32, [None, 416, 416, 3])
model = nets.YOLOv2(inputs, nets.Darknet19)

img = nets.utils.load_img('cat.png')

with tf.Session() as sess:
    sess.run(model.pretrained())
    preds = sess.run(model, {inputs: model.preprocess(img)})
    boxes = model.get_boxes(preds, img.shape[1:3])

Like other models, a detection model also returns tf.Tensor as its output. You can see the bounding box predictions (x1, y1, x2, y2, score) by using model.get_boxes(model_output, original_img_shape) and visualize the results:

from tensornets.datasets import voc
print("%s: %s" % (voc.classnames[7], boxes[7][0]))  # 7 is cat

import numpy as np
import matplotlib.pyplot as plt
box = boxes[7][0]
plt.imshow(img[0].astype(np.uint8))
plt.gca().add_patch(plt.Rectangle(
    (box[0], box[1]), box[2] - box[0], box[3] - box[1],
    fill=False, edgecolor='r', linewidth=2))
plt.show()

More detection examples such as FasterRCNN on VOC2007 are here 😎. Note that:

APIs of detection models are slightly different:
- YOLOv3: sess.run(model.preds, {inputs: img}),
- YOLOv2: sess.run(model, {inputs: img}),
- FasterRCNN: sess.run(model, {inputs: img, model.scales: scale}),
FasterRCNN requires roi_pooling:
- git clone https://github.com/deepsense-io/roi-pooling && cd roi-pooling && vi roi_pooling/Makefile and edit according to here,
- python setup.py install.

Utilities

Besides pretrained() and preprocess(), the output tf.Tensor provides the following useful methods:

get_middles(): returns a list of all the representative tf.Tensor end-points,
get_outputs(): returns a list of all the tf.Tensor end-points,
get_weights(): returns a list of all the tf.Tensor weight matrices,
print_middles(): prints all the representative end-points,
print_outputs(): prints all the end-points,
print_weights(): prints all the weight matrices,
print_summary(): prints the numbers of layers, weight matrices, and parameters.

Example outputs of print methods are:

>>> model.print_middles()
Scope: resnet50
conv2/block1/out:0 (?, 56, 56, 256)
conv2/block2/out:0 (?, 56, 56, 256)
conv2/block3/out:0 (?, 56, 56, 256)
conv3/block1/out:0 (?, 28, 28, 512)
conv3/block2/out:0 (?, 28, 28, 512)
conv3/block3/out:0 (?, 28, 28, 512)
conv3/block4/out:0 (?, 28, 28, 512)
conv4/block1/out:0 (?, 14, 14, 1024)
...

>>> model.print_outputs()
Scope: resnet50
conv1/pad:0 (?, 230, 230, 3)
conv1/conv/BiasAdd:0 (?, 112, 112, 64)
conv1/bn/batchnorm/add_1:0 (?, 112, 112, 64)
conv1/relu:0 (?, 112, 112, 64)
pool1/pad:0 (?, 114, 114, 64)
pool1/MaxPool:0 (?, 56, 56, 64)
conv2/block1/0/conv/BiasAdd:0 (?, 56, 56, 256)
conv2/block1/0/bn/batchnorm/add_1:0 (?, 56, 56, 256)
conv2/block1/1/conv/BiasAdd:0 (?, 56, 56, 64)
conv2/block1/1/bn/batchnorm/add_1:0 (?, 56, 56, 64)
conv2/block1/1/relu:0 (?, 56, 56, 64)
...

>>> model.print_weights()
Scope: resnet50
conv1/conv/weights:0 (7, 7, 3, 64)
conv1/conv/biases:0 (64,)
conv1/bn/beta:0 (64,)
conv1/bn/gamma:0 (64,)
conv1/bn/moving_mean:0 (64,)
conv1/bn/moving_variance:0 (64,)
conv2/block1/0/conv/weights:0 (1, 1, 64, 256)
conv2/block1/0/conv/biases:0 (256,)
conv2/block1/0/bn/beta:0 (256,)
conv2/block1/0/bn/gamma:0 (256,)
...

>>> model.print_summary()
Scope: resnet50
Total layers: 54
Total weights: 320
Total parameters: 25,636,712

Examples

Comparison of different networks:

inputs = tf.placeholder(tf.float32, [None, 224, 224, 3])
models = [
    nets.MobileNet75(inputs),
    nets.MobileNet100(inputs),
    nets.SqueezeNet(inputs),
]

img = utils.load_img('cat.png', target_size=256, crop_size=224)
imgs = nets.preprocess(models, img)

with tf.Session() as sess:
    nets.pretrained(models)
    for (model, img) in zip(models, imgs):
        preds = sess.run(model, {inputs: img})
        print(utils.decode_predictions(preds, top=2)[0])

Transfer learning:

inputs = tf.placeholder(tf.float32, [None, 224, 224, 3])
outputs = tf.placeholder(tf.float32, [None, 50])
model = nets.DenseNet169(inputs, is_training=True, classes=50)

loss = tf.losses.softmax_cross_entropy(outputs, model)
train = tf.train.AdamOptimizer(learning_rate=1e-5).minimize(loss)

with tf.Session() as sess:
    nets.pretrained(model)
    for (x, y) in your_NumPy_data:  # the NHWC and one-hot format
        sess.run(train, {inputs: x, outputs: y})

Using multi-GPU:

inputs = tf.placeholder(tf.float32, [None, 224, 224, 3])
models = []

with tf.device('gpu:0'):
    models.append(nets.ResNeXt50(inputs))

with tf.device('gpu:1'):
    models.append(nets.DenseNet201(inputs))

from tensornets.preprocess import fb_preprocess
img = utils.load_img('cat.png', target_size=256, crop_size=224)
img = fb_preprocess(img)

with tf.Session() as sess:
    nets.pretrained(models)
    preds = sess.run(models, {inputs: img})
    for pred in preds:
        print(utils.decode_predictions(pred, top=2)[0])

Performance

Image classification

The top-k errors were obtained with TensorNets on ImageNet validation set and may slightly differ from the original ones. The crop size used was 224x224 for all models except NASNetAlarge (331x331), Inception3 (299x299), Inception4 (299x299), InceptionResNet2 (299x299), and ResNet50-152v2 (299x299).
- Top-1: single center crop, top-1 error
- Top-5: single center crop, top-5 error
- 10-5: ten crops (1 center + 4 corners and those mirrored ones), top-5 error
- Size: rounded the number of parameters (w/ fully-connected layers)
- Stem: rounded the number of parameters (w/o fully-connected layers)
The computation times were measured on NVIDIA Tesla P100 (3584 cores, 16 GB global memory) with cuDNN 6.0 and CUDA 8.0.
- Speed: milliseconds for inferences of 100 images

	Top-1	Top-5	10-5	Size	Stem	Speed	References
ResNet50	25.126	7.982	6.842	25.6M	23.6M	195.4	[paper] [tf-slim] [torch-fb] [caffe] [keras]
ResNet101	23.580	7.214	6.092	44.7M	42.7M	311.7	[paper] [tf-slim] [torch-fb] [caffe]
ResNet152	23.396	6.882	5.908	60.4M	58.4M	439.1	[paper] [tf-slim] [torch-fb] [caffe]
ResNet50v2	24.040	6.966	5.896	25.6M	23.6M	209.7	[paper] [tf-slim] [torch-fb]
ResNet101v2	22.766	6.184	5.158	44.7M	42.6M	326.2	[paper] [tf-slim] [torch-fb]
ResNet152v2	21.968	5.838	4.900	60.4M	58.3M	455.2	[paper] [tf-slim] [torch-fb]
ResNet200v2	21.714	5.848	4.830	64.9M	62.9M	618.3	[paper] [tf-slim] [torch-fb]
ResNeXt50c32	22.260	6.190	5.410	25.1M	23.0M	267.4	[paper] [torch-fb]
ResNeXt101c32	21.270	5.706	4.842	44.3M	42.3M	427.9	[paper] [torch-fb]
ResNeXt101c64	20.506	5.408	4.564	83.7M	81.6M	877.8	[paper] [torch-fb]
WideResNet50	21.982	6.066	5.116	69.0M	66.9M	358.1	[paper] [torch]
Inception1	33.160	12.324	10.246	7.0M	6.0M	165.1	[paper] [tf-slim] [caffe-zoo]
Inception2	25.320	7.844	6.414	11.2M	10.2M	134.3	[paper] [tf-slim]
Inception3	22.054	6.242	5.000	23.9M	21.8M	314.6	[paper] [tf-slim] [keras]
Inception4	19.880	5.022	4.206	42.7M	41.2M	582.1	[paper] [tf-slim]
InceptionResNet2	19.744	4.748	3.962	55.9M	54.3M	656.8	[paper] [tf-slim]
NASNetAlarge	17.502	3.996	3.412	93.5M	89.5M	2081	[paper] [tf-slim]
NASNetAmobile	25.634	8.146	6.758	7.7M	6.7M	165.8	[paper] [tf-slim]
PNASNetlarge	17.366	3.950	3.358	86.2M	81.9M	1978	[paper] [tf-slim]
VGG16	28.732	9.950	8.834	138.4M	14.7M	348.4	[paper] [keras]
VGG19	28.744	10.012	8.774	143.7M	20.0M	399.8	[paper] [keras]
DenseNet121	25.028	7.742	6.522	8.1M	7.0M	202.9	[paper] [torch]
DenseNet169	23.824	6.824	5.860	14.3M	12.6M	219.1	[paper] [torch]
DenseNet201	22.680	6.380	5.466	20.2M	18.3M	272.0	[paper] [torch]
MobileNet25	48.418	24.208	21.196	0.5M	0.2M	34.46	[paper] [tf-slim]
MobileNet50	35.708	14.376	12.180	1.3M	0.8M	52.46	[paper] [tf-slim]
MobileNet75	31.588	11.758	9.878	2.6M	1.8M	70.11	[paper] [tf-slim]
MobileNet100	29.576	10.496	8.774	4.3M	3.2M	83.41	[paper] [tf-slim]
MobileNet35v2	39.914	17.568	15.422	1.7M	0.4M	57.04	[paper] [tf-slim]
MobileNet50v2	34.806	13.938	11.976	2.0M	0.7M	64.35	[paper] [tf-slim]
MobileNet75v2	30.468	10.824	9.188	2.7M	1.4M	88.68	[paper] [tf-slim]
MobileNet100v2	28.664	9.858	8.322	3.5M	2.3M	93.82	[paper] [tf-slim]
MobileNet130v2	25.320	7.878	6.728	5.4M	3.8M	130.4	[paper] [tf-slim]
MobileNet140v2	24.770	7.578	6.518	6.2M	4.4M	132.9	[paper] [tf-slim]
SqueezeNet	45.566	21.960	18.578	1.2M	0.7M	71.43	[paper] [caffe]

Object detection

The object detection models can be coupled with any network but mAPs could be measured only for the models with pre-trained weights. Note that:
- YOLOv3VOC was trained by taehoonlee with this recipe modified as max_batches=70000, steps=40000,60000,
- YOLOv2VOC is equivalent to YOLOv2(inputs, Darknet19),
- TinyYOLOv2VOC: TinyYOLOv2(inputs, TinyDarknet19),
- FasterRCNN_ZF_VOC: FasterRCNN(inputs, ZF),
- FasterRCNN_VGG16_VOC: FasterRCNN(inputs, VGG16, stem_out='conv5/3').
The mAPs were obtained with TensorNets and may slightly differ from the original ones. The test input sizes were the numbers reported as the best in the papers:
- YOLOv3, YOLOv2: 416x416
- FasterRCNN: min_shorter_side=600, max_longer_side=1000
The computation times were measured on NVIDIA Tesla P100 (3584 cores, 16 GB global memory) with cuDNN 6.0 and CUDA 8.0.
- Size: rounded the number of parameters
- Speed: milliseconds only for network inferences of a 416x416 or 608x608 single image
- FPS: 1000 / speed

PASCAL VOC2007 test	mAP	Size	Speed	FPS	References
YOLOv3VOC (416)	0.7423	62M	24.09	41.51	[paper] [darknet] [darkflow]
YOLOv2VOC (416)	0.7320	51M	14.75	67.80	[paper] [darknet] [darkflow]
TinyYOLOv2VOC (416)	0.5303	16M	6.534	153.0	[paper] [darknet] [darkflow]
FasterRCNN_ZF_VOC	0.4466	59M	241.4	3.325	[paper] [caffe] [roi-pooling]
FasterRCNN_VGG16_VOC	0.6872	137M	300.7	4.143	[paper] [caffe] [roi-pooling]

MS COCO val2014	mAP	Size	Speed	FPS	References
YOLOv3COCO (608)	0.6016	62M	60.66	16.49	[paper] [darknet] [darkflow]
YOLOv3COCO (416)	0.6028	62M	40.23	24.85	[paper] [darknet] [darkflow]
YOLOv2COCO (608)	0.5189	51M	45.88	21.80	[paper] [darknet] [darkflow]
YOLOv2COCO (416)	0.4922	51M	21.66	46.17	[paper] [darknet] [darkflow]

News 📰

MS COCO utils are released, 9 Jul 2018.
PNASNetlarge is released, 12 May 2018.
The six variants of MobileNetv2 are released, 5 May 2018.
YOLOv3 for COCO and VOC are released, 4 April 2018.
Generic object detection models for YOLOv2 and FasterRCNN are released, 26 March 2018.

Future work 🔥

Add training codes.
Add image classification models.
- PolyNet: A Pursuit of Structural Diversity in Very Deep Networks, CVPR 2017, Top-5 4.25%
- Squeeze-and-Excitation Networks, CVPR 2018, Top-5 3.79%
- GPipe: Efficient Training of Giant Neural Networks using Pipeline Parallelism, arXiv 2018, Top-5 3.0%
Add object detection models (MaskRCNN, SSD).
Add image segmentation models (FCN, UNet).
Add image datasets (OpenImages).
Add style transfer examples which can be coupled with any network in TensorNets.
Add speech and language models with representative datasets (WaveNet, ByteNet).

Name		Name	Last commit message	Last commit date
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examples		examples
tensornets		tensornets
tests		tests
translations		translations
.travis.yml		.travis.yml
LICENSE		LICENSE
MANIFEST.in		MANIFEST.in
README.md		README.md
cat.png		cat.png
pytest.ini		pytest.ini
setup.py		setup.py

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TensorNets

Guiding principles

Installation

A quick example

Object detection example

Utilities

Examples

Performance

Image classification

Object detection

News 📰

Future work 🔥

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