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95 lines
5.5 KiB
Rust
95 lines
5.5 KiB
Rust
// Copyright 2019-present, the HuggingFace Inc. team, The Google AI Language Team and Facebook, Inc.
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// Copyright 2019 Guillaume Becquin
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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extern crate failure;
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use tch::{Device, nn, Tensor, no_grad};
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use rust_tokenizers::{RobertaTokenizer, TruncationStrategy, Tokenizer};
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use rust_bert::bart::{BartConfig, BartConfigResources, BartVocabResources, BartMergesResources, BartModelResources, BartModel};
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use rust_bert::Config;
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use rust_bert::resources::{Resource, download_resource, RemoteResource};
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fn main() -> failure::Fallible<()> {
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// Resources paths
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let config_resource = Resource::Remote(RemoteResource::from_pretrained(BartConfigResources::BART));
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let vocab_resource = Resource::Remote(RemoteResource::from_pretrained(BartVocabResources::BART));
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let merges_resource = Resource::Remote(RemoteResource::from_pretrained(BartMergesResources::BART));
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let weights_resource = Resource::Remote(RemoteResource::from_pretrained(BartModelResources::BART));
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let config_path = download_resource(&config_resource)?;
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let vocab_path = download_resource(&vocab_resource)?;
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let merges_path = download_resource(&merges_resource)?;
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let weights_path = download_resource(&weights_resource)?;
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// Set-up masked LM model
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let device = Device::cuda_if_available();
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let mut vs = nn::VarStore::new(device);
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let tokenizer = RobertaTokenizer::from_file(vocab_path.to_str().unwrap(), merges_path.to_str().unwrap(), false);
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let config = BartConfig::from_file(config_path);
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let mut bart_model = BartModel::new(&vs.root(), &config, false);
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vs.load(weights_path)?;
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// Define input
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let input = ["In findings published Tuesday in Cornell University's arXiv by a team of scientists \
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from the University of Montreal and a separate report published Wednesday in Nature Astronomy by a team \
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from University College London (UCL), the presence of water vapour was confirmed in the atmosphere of K2-18b, \
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a planet circling a star in the constellation Leo. This is the first such discovery in a planet in its star's \
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habitable zone — not too hot and not too cold for liquid water to exist. The Montreal team, led by Björn Benneke, \
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used data from the NASA's Hubble telescope to assess changes in the light coming from K2-18b's star as the planet \
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passed between it and Earth. They found that certain wavelengths of light, which are usually absorbed by water, \
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weakened when the planet was in the way, indicating not only does K2-18b have an atmosphere, but the atmosphere \
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contains water in vapour form. The team from UCL then analyzed the Montreal team's data using their own software \
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and confirmed their conclusion. This was not the first time scientists have found signs of water on an exoplanet, \
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but previous discoveries were made on planets with high temperatures or other pronounced differences from Earth. \
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\"This is the first potentially habitable planet where the temperature is right and where we now know there is water,\" \
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said UCL astronomer Angelos Tsiaras. \"It's the best candidate for habitability right now.\" \"It's a good sign\", \
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said Ryan Cloutier of the Harvard–Smithsonian Center for Astrophysics, who was not one of either study's authors. \
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\"Overall,\" he continued, \"the presence of water in its atmosphere certainly improves the prospect of K2-18b being \
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a potentially habitable planet, but further observations will be required to say for sure. \"
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K2-18b was first identified in 2015 by the Kepler space telescope. It is about 110 light-years from Earth and larger \
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but less dense. Its star, a red dwarf, is cooler than the Sun, but the planet's orbit is much closer, such that a year \
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on K2-18b lasts 33 Earth days. According to The Guardian, astronomers were optimistic that NASA's James Webb space \
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telescope — scheduled for launch in 2021 — and the European Space Agency's 2028 ARIEL program, could reveal more \
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about exoplanets like K2-18b."];
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// Credits: WikiNews, CC BY 2.5 license (https://en.wikinews.org/wiki/Astronomers_find_water_vapour_in_atmosphere_of_exoplanet_K2-18b)
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let tokenized_input = tokenizer.encode_list(input.to_vec(), 1024, &TruncationStrategy::LongestFirst, 0);
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let max_len = tokenized_input.iter().map(|input| input.token_ids.len()).max().unwrap();
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let tokenized_input = tokenized_input.
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iter().
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map(|input| input.token_ids.clone()).
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map(|mut input| {
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input.extend(vec![0; max_len - input.len()]);
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input
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}).
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map(|input|
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Tensor::of_slice(&(input))).
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collect::<Vec<_>>();
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let input_tensor = Tensor::stack(tokenized_input.as_slice(), 0).to(device);
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// Forward pass
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let (decoder_output, encoder_output, _, _, _, _, _) = no_grad(|| {
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bart_model
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.forward_t(Some(&input_tensor),
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None,
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None,
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None,
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None,
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false)
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});
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// Print masked tokens
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println!("{:?}", encoder_output);
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println!("{:?}", decoder_output);
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Ok(())
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} |