[ti:NASA Seeks Public’s Help to Train AI for Mars Rovers]
[by:www.21voa.com]
[00:00.00]更多听力请访问21VOA.COM
[00:00.04]The American space agency NASA
[00:03.60]is seeking help from the public
[00:07.04]to identify important images captured by Mars explorers.
[00:14.32]The project is designed
[00:17.20]to help teach an artificial intelligence, AI, system
[00:23.00]to recognize different scientific elements seen in the pictures.
[00:29.56]Some of the images were captured by Perseverance,
[00:35.00]NASA's latest Mars rover, or explorer.
[00:39.76]Others came from the agency's Spirit and Opportunity rovers.
[00:47.36]AI plays an important part in NASA's efforts
[00:51.92]to process data collected by its spacecraft and exploring vehicles.
[00:59.60]The space agency develops AI algorithms
[01:04.72]to identify and group elements of scientific interest.
[01:10.44]But the algorithms must be trained by humans
[01:15.92]in order for them to work.
[01:18.12]That is where private citizens can help.
[01:23.32]NASA says Perseverance can send
[01:26.88]hundreds of images to Earth on any given day.
[01:31.84]Scientists and engineers examine the images
[01:36.84]as they search for different geological qualities
[01:41.28]of the surface of Mars.
[01:44.12]These images can also help guide Perseverance
[01:49.48]and other rovers operating on Mars.
[01:53.44]But the team on Earth faces a very short timeline.
[01:59.16]NASA said in a recent statement, "After those images
[02:04.76]travel millions of miles from Mars to Earth,
[02:08.56]the team members have a matter of hours
[02:12.32]to develop the next set of instructions."
[02:16.40]Those instructions
[02:19.16]-- based on what the NASA team sees in the images
[02:23.52]-- must then be sent back to Perseverance.
[02:28.24]Vivian Sun is a scientist at NASA's
[02:32.52]Jet Propulsion Laboratory (JPL) in California.
[02:37.48]She helps oversee the daily operations of Perseverance.
[02:43.32]She also advises those
[02:46.40]who run the public project, called AI4Mars.
[02:51.52]"It's not possible for any one scientist
[02:56.16]to look at all the downlinked images with scrutiny
[03:01.08]in such a short amount of time, every single day,"
[03:05.64]Sun said in an online statement.
[03:09.00]"It would save us time if there was an algorithm that could say,
[03:14.56]‘I think I saw rock veins or nodules over here,'
[03:19.92]and then the science team can look at those areas with more detail."
[03:26.20]The AI4Mars project aims to build a large,
[03:31.84]solid set of data created from thousands of images.
[03:37.32]Researchers can use these images
[03:41.16]to quickly discover interesting geological features.
[03:46.16]It is much easier for other AI researchers to train their algorithms
[03:52.72]on available pictures of many earthly things.
[03:57.32]But NASA did not have such a massive collection
[04:01.84]of Mars images to work with.
[04:05.00]Citizen scientists who wish to take part in the AI4Mars project
[04:11.60]can visit a special website to start.
[04:16.32]There, users will find an online tool
[04:20.36]that can be used to make lines around features in the images
[04:25.28]such as sand and different kinds of rock.
[04:29.96]Once these features are marked,
[04:32.92]a user can choose from descriptions
[04:36.00]that fit what is in the images.
[04:39.20]NASA says the latest version of the AI4Mars system
[04:45.24]lets people choose more detailed descriptions.
[04:49.24]Annie Didier is a JPL scientist
[04:53.80]who works on the Perseverance version of AI4Mars.
[04:59.16]She said creating a strong dataset
[05:03.24]can serve several important purposes.
[05:06.80]"With this algorithm, the rover could automatically select
[05:12.36]science targets to drive to," she said.
[05:16.44]It could also permit rovers on Mars
[05:20.60]to store numerous images and then send back
[05:24.92]only the ones that scientists are interested in, she added.
[05:30.76]NASA says AI4Mars is the continuation of another project
[05:38.00]launched last year that used images collected by the Curiosity rover.
[05:44.68]In that project, people were able to outline and mark features
[05:50.64]like sand and rock from nearly half a million images.
[05:56.40]The result of that effort was an algorithm
[06:00.36]called Soil Property and Object Classification.
[06:05.00]NASA says that system can correctly identify
[06:09.80]the features it was trained on about 98 percent of the time.
[06:16.04]I'm Bryan Lynn. 更多听力请访问21VOA.COM
END OF TRACK. "END OF TRACK." The two men bowed. "Whoever was that person you were talking to?" she enquired, as soon as they stood together. The took of triumph faded from her eyes, she had grown worn and weary. The roses were wilting on the walls, the lights were mostly down now. Hetty, looking in to see if anything was wanted, found herself driven away almost fiercely. I only saw Master Jervie once when he called at tea time, The year 1747 was opened by measures of restriction. The House of Lords, offended at the publication of the proceedings of the trial of Lord Lovat, summoned the parties to their bar, committed them to prison, and refused to liberate them till they had pledged themselves not to repeat the offence, and had paid very heavy fees. The consequence of this was that the transactions of the Peers were almost entirely suppressed for nearly thirty years from this time, and we draw our knowledge of them chiefly from notes taken by Horace Walpole and Lord Chancellor Hardwicke. What is still more remarkable, the reports of the House of Commons, being taken by stealth, and on the merest sufferance, are of the most meagre kind, sometimes altogether wanting, and the speeches are given uniformly under fictitious names; for to have attributed to Pitt or Pelham their[112] speeches by name would have brought down on the printers the summary vengeance of the House. Many of the members complained bitterly of this breach of the privileges of Parliament, and of "being put into print by low fellows"; but Pelham had the sense to tolerate them, saying, "Let them alone; they make better speeches for us than we can make for ourselves." Altogether, the House of Commons exhibited the most deplorable aspect that can be conceived. The Ministry had pursued Walpole's system of buying up opponents by place, or pension, or secret service money, till there was no life left in the House. Ministers passed their measures without troubling themselves to say much in their behalf; and the opposition dwindled to Sir John Hinde Cotton, now dismissed from office, and a feeble remnant of Jacobites raised but miserable resistance. In vain the Prince of Wales and the secret instigations of Bolingbroke and Doddington stimulated the spirit of discontent; both Houses had degenerated into most silent and insignificant arenas of very commonplace business. "It certainly will be. Miss Widgeon," answered Maria, with strictly "company manners." "One who has never had a brother exposed to the constant dangers of army life can hardly understand how glad we all feel to have Si snatched from the very jaws of death and brung back to us." "Just plug at 'em as you would at a crow, and then go on your way whistlin'?" persisted Harry. "Hurroo!" echoed Hennessey; "that's the ticket." "Come forward, keeper," continued the baron, "and state how these arrows came into your hands!" "Yes." HoMEJULIA京香2018下载
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