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META TOPICPARENT |
name="InterOpMay2014" |
Schedule |
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< < | There is only one Semantics session: Wednesday 21 May, 12:00–13:30, in room D052 |
> > | There is only one Semantics session: Wednesday 21 May, 12:00–13:30, in room D052 |
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< < |
Nicolas Moreau |
Vocabulary developments in Paris |
12:00–12:20 |
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Baptiste Cecconi |
UCD extension for planetary data |
12:20–12:40 |
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Norman Gray |
Machine learning, and the identification of UCDs |
12:40–13:00 |
pdf |
Norman/Sébastien |
VOUnits discussion |
13:00–13:05 |
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ALL |
WG next projects |
13:05–13:30 |
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> > |
Nicolas Moreau |
Vocabulary developments in Paris |
12:00–12:20 |
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Baptiste Cecconi |
UCD extension for planetary data |
12:20–12:40 |
pdf |
Norman Gray |
Machine learning, and the identification of UCDs |
12:40–13:00 |
pdf |
Norman/Sébastien |
VOUnits discussion |
13:00–13:05 |
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ALL |
WG next projects |
13:05–13:30 |
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Notes from the Semantics session
Thanks to MireilleLouys for the session notes
Nicolas Moreau: Vocabulary developments in Paris |
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< < | Discussion of mappings between Paris's astronomy thesaurus and other thesauri. Discussion of the length of time it takes to do the mapping. |
> > | Discussion of mappings between Paris's astronomy thesaurus and other thesauri. Discussion of the length of time it takes to do the mapping. Some of the Mapping is done by NIST |
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< < | Some of the Mapping is done by NIST |
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< < | Links with the Unified Astronomy Thesaurus (UAT). SebastienDerriere will follow up these links. Contact is AlbertoAccomazzi.
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> > | Links with the Unified Astronomy Thesaurus (UAT). SebastienDerriere will follow up these links. Contact is AlbertoAccomazzi. |
| Several of the thesauri are maintained as structured text, from which SKOS is generated straightforwardly.
Baptiste Cecconi: UCD extension for planetary data
A new doc uploaded on the IVOA page.
Various proposed UCD discussed in the session |
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- em.mol.line observed: could be changed in present , considered , etc..
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- em.mol.line observed: could be changed in present , considered , etc..
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- FG: em below 10Mhz: what does it mean? Should the UCDs avoid interval overlaps?
- NG: does not the context help to disentangle?
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- Planetary science needs a category below 20MHz
- Should we adapt to the community usage, and if so suggest em.pw for plasma wave
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- Planetary science needs a category below 20MHz
- Should we adapt to the community usage, and if so suggest em.pw for plasma wave
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- The limit 20Mhz is really bound to atmospheric limit, so it's physically motivated.
- Keep em.radio.below10MHz or at least this 0-1Khz or 20Khz is the typical range for space
Norman Gray: Machine learning, and the identification of UCDs |
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- MG:do you remove some words in the text description? NG: the tool is made for larger portion of text but works on simple sentences rather nicely. Units may help to veto some assignments (instead of weight for assignments)
- MG: use a validation step to prevent from overfitting the result. Might be interesting to use a validation data set which is possibly completely independent.
- Which training set? The UCD list for instance
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- MG:do you remove some words in the text description? NG: the tool is made for larger portion of text but works on simple sentences rather nicely. Units may help to veto some assignments (instead of weight for assignments)
- MG: use a validation step to prevent from overfitting the result. Might be interesting to use a validation data set which is possibly completely independent.
- Which training set? The UCD list for instance
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- MG: how to use the column name information as a complementary feature? This could help, theses are chosen with some sense of logic.
- SD: can you expect the system to propose a suggestion for a UCD ( use it as a predictive assignment tool) NG: No because it takes the whole string as one, and is not tokenizing the diff parts of the UCD string.
- PS: what if we use other kind of classifiers like Self Oarganizing Maps? MG: Such methods have been used for object types SKOS list, similarity measure should be defined for this kind of approach.
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- MG, NG: size of training set to be increased: several thousands of items should be a valuable test configuration.
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- MG, NG: size of training set to be increased: several thousands of items should be a valuable test configuration.
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Norman/Sébastien: VOUnits discussion
VO-Units it at the end of the RFC process. |
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< < | ALL: WG next projects |
> > | ALL: WG next projects |
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What are the next topics ?
- MG: A "dmtype" attribute is going to be included in VOtable specification on GROUPs and FIELDref: Is there an impact of the Semantic WG?
- Do we have to use SKOS concepts for consistency checks of this semantic tag?
- ML: should be a data model tag, leading to consistency with a DM context?
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- NG: LINKS item of VOTABLE could be used to convey data model information ( like Utypes)
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- NG: LINKS item of VOTABLE could be used to convey data model information ( like Utypes)
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Update of UCD VO list |
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< < | Action on MireilleLouys to contact the people of the committee for Maintenance UCD and circulate the list of proposed add-ons and corrections. |
> > | Action on MireilleLouys to contact the people of the committee for Maintenance UCD and circulate the list of proposed add-ons and corrections. NG and MG agreed to join the committee. |
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< < | NG and MG agreed to join the committee. |
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< < | |
| -- NormanGray - 2014-05-22 |
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META FILEATTACHMENT |
attachment="talk-gray-ucd.pdf" attr="" comment="Norman's slides" date="1400746018" name="talk-gray-ucd.pdf" path="talk-gray-ucd.pdf" size="184541" user="NormanGray" version="1" |
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META FILEATTACHMENT |
attachment="BC-Planetary-UCD.pdf" attr="" comment="" date="1400773786" name="BC-Planetary-UCD.pdf" path="BC-Planetary-UCD.pdf" size="1003939" user="BaptisteCecconi" version="1" |
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