R interface to TensorFlow Hub

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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 elements of machine studying fashions. A module is a self-contained piece of a TensorFlow graph, together with its weights and property, that may be reused throughout completely different duties in a course of often called switch studying.

The CRAN model of tfhub may be put in with:

After putting in the R bundle you might want to set up the TensorFlow Hub python bundle. You are able to do it by operating:

Getting began

The important perform of tfhub is layer_hub which works similar to a keras layer however lets you 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"
)

It will obtain the MobileNet mannequin pre-trained on the ImageNet dataset. tfhub fashions are cached domestically and don’t have to be downloaded the following time you employ the identical mannequin.

Now you can use layer_mobilenet as a typical 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:

Grace Hopper
img <- image_load("https://blogs.rstudio.com/tensorflow/posts/photos/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              swimsuit 5.729345
4  n03787032       mortarboard 5.400651
5  n03929855       pickelhaube 5.008665

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

TensorFlow Hub

You’ll find extra examples of layer_hub utilization within the following articles on the TensorFlow for R web site:

Utilization with Recipes and the Function Spec API

tfhub additionally gives 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 = practice) %>%
  step_pretrained_text_embedding(
    comment_text,
    deal with = "https://tfhub.dev/google/tf2-preview/gnews-swivel-20dim-with-oov/1"
  ) %>%
  step_bin2factor(obscene)

You may see an entire operating instance right here.

It’s also possible to use tfhub with the brand new Function Spec API carried out in tfdatasets. You may see an entire instance right here.

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

Reuse

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

Quotation

For attribution, please cite this work as

Falbel (2019, Dec. 18). RStudio 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,
  creator = {Falbel, Daniel},
  title = {RStudio AI Weblog: tfhub: R interface to TensorFlow Hub},
  url = {https://blogs.rstudio.com/tensorflow/posts/2019-12-18-tfhub-0.7.0/},
  yr = {2019}
}

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