Easily train your own text-generating neural network of any size and complexity on any text dataset with a few lines of code, or quickly train on a text using a pretrained model.
from textgenrnn import textgenrnn textgen = textgenrnn() textgen.generate()
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The included model can easily be trained on new texts, and can generate appropriate text even after a single pass of the input data.
textgen.train_from_file('hacker_news_2000.txt', num_epochs=1) textgen.generate()
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The model weights are relatively small (2 MB on disk), and they can easily be saved and loaded into a new textgenrnn instance. As a result, you can play with models which have been trained on hundreds of passes through the data. (in fact, textgenrnn learns so well that you have to increase the temperature significantly for creative output!)
textgen_2 = textgenrnn('/weights/hacker_news.hdf5') textgen_2.generate(3, temperature=1.0)
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You can also train a new model, with support for word level embeddings and bidirectional RNN layers by adding
new_model=True to any train function.
It's also possible to get involved in how the output unfolds, step by step. Interactive mode will suggest you the top N options for the next char/word, and allows you to pick one.
When running textgenrnn in the terminal, pass
generate. N defaults to 3.
from textgenrnn import textgenrnn textgen = textgenrnn() textgen.generate(interactive=True, top_n=5)
This can add a human touch to the output; it feels like you're the writer! (reference)
textgenrnn can be installed from pypi via
pip3 install textgenrnn
For the latest textgenrnn, you must have a minimum TensorFlow version of 2.1.0.
You can view a demo of common features and model configuration options in this Jupyter Notebook.
/datasets contains example datasets using Hacker News/Reddit data for training textgenrnn.
/weights contains further-pretrained models on the aforementioned datasets which can be loaded into textgenrnn.
/outputs contains examples of text generated from the above pretrained models.
The included pretrained-model follows a neural network architecture inspired by DeepMoji. For the default model, textgenrnn takes in an input of up to 40 characters, converts each character to a 100-D character embedding vector, and feeds those into a 128-cell long-short-term-memory (LSTM) recurrent layer. Those outputs are then fed into another 128-cell LSTM. All three layers are then fed into an Attention layer to weight the most important temporal features and average them together (and since the embeddings + 1st LSTM are skip-connected into the attention layer, the model updates can backpropagate to them more easily and prevent vanishing gradients). That output is mapped to probabilities for up to 394 different characters that they are the next character in the sequence, including uppercase characters, lowercase, punctuation, and emoji. (if training a new model on a new dataset, all of the numeric parameters above can be configured)
Alternatively, if context labels are provided with each text document, the model can be trained in a contextual mode, where the model learns the text given the context so the recurrent layers learn the decontextualized language. The text-only path can piggy-back off the decontextualized layers; in all, this results in much faster training and better quantitative and qualitative model performance than just training the model gien the text alone.
The model weights included with the package are trained on hundreds of thousands of text documents from Reddit submissions (via BigQuery), from a very diverse variety of subreddits. The network was also trained using the decontextual approach noted above in order to both improve training performance and mitigate authorial bias.
When fine-tuning the model on a new dataset of texts using textgenrnn, all layers are retrained. However, since the original pretrained network has a much more robust "knowledge" initially, the new textgenrnn trains faster and more accurately in the end, and can potentially learn new relationships not present in the original dataset (e.g. the pretrained character embeddings include the context for the character for all possible types of modern internet grammar).
Additionally, the retraining is done with a momentum-based optimizer and a linearly decaying learning rate, both of which prevent exploding gradients and makes it much less likely that the model diverges after training for a long time.
You will not get quality generated text 100% of the time, even with a heavily-trained neural network. That's the primary reason viral blog posts/Twitter tweets utilizing NN text generation often generate lots of texts and curate/edit the best ones afterward.
Results will vary greatly between datasets. Because the pretrained neural network is relatively small, it cannot store as much data as RNNs typically flaunted in blog posts. For best results, use a dataset with at least 2,000-5,000 documents. If a dataset is smaller, you'll need to train it for longer by setting
num_epochs higher when calling a training method and/or training a new model from scratch. Even then, there is currently no good heuristic for determining a "good" model.
A GPU is not required to retrain textgenrnn, but it will take much longer to train on a CPU. If you do use a GPU, I recommend increasing the
batch_size parameter for better hardware utilization.
More formal documentation
A web-based implementation using tensorflow.js (works especially well due to the network's small size)
A way to visualize the attention-layer outputs to see how the network "learns."
A mode to allow the model architecture to be used for chatbot conversations (may be released as a separate project)
More depth toward context (positional context + allowing multiple context labels)
A larger pretrained network which can accommodate longer character sequences and a more indepth understanding of language, creating better generated sentences.
Hierarchical softmax activation for word-level models (once Keras has good support for it).
FP16 for superfast training on Volta/TPUs (once Keras has good support for it).
Max Woolf (@minimaxir)
Max's open-source projects are supported by his Patreon. If you found this project helpful, any monetary contributions to the Patreon are appreciated and will be put to good creative use.
Andrej Karpathy for the original proposal of the char-rnn via the blog post The Unreasonable Effectiveness of Recurrent Neural Networks.
Attention-layer code used from DeepMoji (MIT Licensed)