R interface to TensorFlow Hub

We’re happy to announce that the primary model of tfhub is now on CRAN. tfhub is an R interface to TensorFlow Hub – a library for the publication, discovery, and consumption of reusable components of machine studying fashions. A module is a self-contained piece of a TensorFlow graph, together with its weights and belongings, that may be reused throughout totally different duties in a course of referred to as switch studying.

The CRAN model of tfhub could be put in with:

After putting in the R package deal it is advisable set up the TensorFlow Hub python package deal. You are able to do it by working:

Getting began

The important operate of tfhub is layer_hub which works similar to a keras layer however means that you can load an entire pre-trained deep studying mannequin.

For instance you possibly can:

library(tfhub)
layer_mobilenet  layer_hub(
  deal with = "https://tfhub.dev/google/tf2-preview/mobilenet_v2/classification/4"
)

This may obtain the MobileNet mannequin pre-trained on the ImageNet dataset. tfhub fashions are cached domestically and don’t must be downloaded the subsequent time you utilize the identical mannequin.

Now you can use layer_mobilenet as a standard Keras layer. For instance you possibly can outline a mannequin:

library(keras)
enter  layer_input(form = c(224, 224, 3))
output  layer_mobilenet(enter)
mannequin  keras_model(enter, output)
abstract(mannequin)

Mannequin: "mannequin"
____________________________________________________________________
Layer (sort)                  Output Form               Param #    
====================================================================
input_2 (InputLayer)          [(None, 224, 224, 3)]      0          
____________________________________________________________________
keras_layer_1 (KerasLayer)    (None, 1001)               3540265    
====================================================================
Whole params: 3,540,265
Trainable params: 0
Non-trainable params: 3,540,265
____________________________________________________________________

This mannequin can now be used to foretell Imagenet labels for a picture. For instance, let’s see the outcomes for the well-known Grace Hopper’s picture:

img  image_load("https://blogs.rstudio.com/tensorflow/posts/pictures/grace-hopper.jpg", target_size = c(224,224)) %>% 
  image_to_array()
img  img/255
dim(img)  c(1, dim(img))
pred  predict(mannequin, img)
imagenet_decode_predictions(pred[,-1,drop=FALSE])[[1]]

  class_name class_description    rating
1  n03763968  military_uniform 9.760404
2  n02817516          bearskin 5.922512
3  n04350905              go well with 5.729345
4  n03787032       mortarboard 5.400651
5  n03929855       pickelhaube 5.008665

TensorFlow Hub additionally presents many different pre-trained picture, textual content and video fashions.
All attainable fashions could be discovered on the TensorFlow hub web site.

You will discover extra examples of layer_hub utilization within the following articles on the TensorFlow for R web site:

Utilization with Recipes and the Characteristic Spec API

tfhub additionally presents recipes steps to make
it simpler to make use of pre-trained deep studying fashions in your machine studying workflow.

For instance, you possibly can outline a recipe that makes use of a pre-trained textual content embedding mannequin with:

rec  recipe(obscene ~ comment_text, information = prepare) %>%
  step_pretrained_text_embedding(
    comment_text,
    deal with = "https://tfhub.dev/google/tf2-preview/gnews-swivel-20dim-with-oov/1"
  ) %>%
  step_bin2factor(obscene)

You’ll be able to see an entire working instance right here.

You may as well use tfhub with the brand new Characteristic Spec API carried out in tfdatasets. You’ll be able to see an entire instance right here.

We hope our readers have enjoyable experimenting with Hub fashions and/or can put them to good use. If you happen to run into any issues, tell us by creating a difficulty within the tfhub repository

Reuse

Textual content and figures are licensed below Artistic Commons Attribution CC BY 4.0. The figures which have been reused from different sources do not fall below this license and could be acknowledged by a observe of their caption: “Determine from …”.

Quotation

For attribution, please cite this work as

Falbel (2019, Dec. 18). Posit AI Weblog: tfhub: R interface to TensorFlow Hub. Retrieved from https://blogs.rstudio.com/tensorflow/posts/2019-12-18-tfhub-0.7.0/

BibTeX quotation

@misc{tfhub,
  writer = {Falbel, Daniel},
  title = {Posit AI Weblog: tfhub: R interface to TensorFlow Hub},
  url = {https://blogs.rstudio.com/tensorflow/posts/2019-12-18-tfhub-0.7.0/},
  12 months = {2019}
}