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    • Lucene Fields:
      New

      Description

      Write test cases to test the new Similarities added in LUCENE-3220. Two types of test cases will be created:

      • unit tests, in which mock statistics are provided to the Similarities and the score is validated against hand calculations;
      • integration tests, in which a small collection is indexed and then searched using the Similarities.

      Performance tests will be performed in a separate issue.

      1. LUCENE-3357.patch
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        David Mark Nemeskey
      2. LUCENE-3357.patch
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey
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        David Mark Nemeskey

        Issue Links

          Activity

          David Mark Nemeskey created issue -
          David Mark Nemeskey made changes -
          Field Original Value New Value
          Link This issue depends on LUCENE-3220 [ LUCENE-3220 ]
          David Mark Nemeskey made changes -
          Labels gsoc gsoc2011
          David Mark Nemeskey made changes -
          Labels gsoc gsoc2011 gsoc gsoc2011 test
          Hide
          David Mark Nemeskey added a comment - - edited

          Integration tests added. There are two of them; however, ant test runs only one?

          Show
          David Mark Nemeskey added a comment - - edited Integration tests added. There are two of them; however, ant test runs only one?
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489572 ]
          Hide
          David Mark Nemeskey added a comment -
          • EasySimilarity subclasses return their names in toString()
          • The two test cases return the name of the Similarity that failed the test.
          Show
          David Mark Nemeskey added a comment - EasySimilarity subclasses return their names in toString() The two test cases return the name of the Similarity that failed the test.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489674 ]
          Hide
          David Mark Nemeskey added a comment -

          Unit tests added.

          Show
          David Mark Nemeskey added a comment - Unit tests added.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489689 ]
          Hide
          David Mark Nemeskey added a comment -

          Rebased the changes on the current state of trunk.

          Show
          David Mark Nemeskey added a comment - Rebased the changes on the current state of trunk.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489833 ]
          Hide
          Robert Muir added a comment -

          looks good as a start: can you add apache license header to the new test file?

          Show
          Robert Muir added a comment - looks good as a start: can you add apache license header to the new test file?
          Hide
          David Mark Nemeskey added a comment -

          License added.

          Show
          David Mark Nemeskey added a comment - License added.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489886 ]
          Hide
          David Mark Nemeskey added a comment -

          Fixed integer division bug in BasicModelG.

          Show
          David Mark Nemeskey added a comment - Fixed integer division bug in BasicModelG.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489892 ]
          Hide
          David Mark Nemeskey added a comment -

          Fixed a bug in TestEasySimilarity that prevented Similarities that use a subclass of EasyStats to be tested. Also, modified EasyStats so that totalBoost is set to the value of queryBoost in the constructor.

          Show
          David Mark Nemeskey added a comment - Fixed a bug in TestEasySimilarity that prevented Similarities that use a subclass of EasyStats to be tested. Also, modified EasyStats so that totalBoost is set to the value of queryBoost in the constructor.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489900 ]
          Hide
          David Mark Nemeskey added a comment -

          Some of the tests fail at certain Similarities, so those have to be fixed as well.

          Show
          David Mark Nemeskey added a comment - Some of the tests fail at certain Similarities, so those have to be fixed as well.
          Hide
          Robert Muir added a comment -

          I wouldn't worry about the scores being negative necessarily myself: there is nothing wrong with this.

          But we should fix the Nan/Inf score problems.

          Also: some of the stats that are newer in Lucene will get stupid results with PreFlex codec, it doesnt support them.

          In my opinion add the following to the test's setup:

              assumeFalse("test cannot run with PreFlex codec !", 
                  "PreFlex".equals(CodecProvider.getDefault().getDefaultFieldCodec()));
          

          and I can help in the places where EasySim collects these stats, for example I think we should add checks in case totalTermFreq = -1, and throw UOE here instead.

          Show
          Robert Muir added a comment - I wouldn't worry about the scores being negative necessarily myself: there is nothing wrong with this. But we should fix the Nan/Inf score problems. Also: some of the stats that are newer in Lucene will get stupid results with PreFlex codec, it doesnt support them. In my opinion add the following to the test's setup: assumeFalse("test cannot run with PreFlex codec !", "PreFlex".equals(CodecProvider.getDefault().getDefaultFieldCodec())); and I can help in the places where EasySim collects these stats, for example I think we should add checks in case totalTermFreq = -1, and throw UOE here instead.
          Hide
          David Mark Nemeskey added a comment -

          Added a spoof version for all search-related classes that are necessary to properly fill the EasyStats object in EasySimilarity subclasses.

          Show
          David Mark Nemeskey added a comment - Added a spoof version for all search-related classes that are necessary to properly fill the EasyStats object in EasySimilarity subclasses.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12489959 ]
          Hide
          David Mark Nemeskey added a comment -

          Robert: I'm on the Nan/Inf problems. As for the negative score, I'll leave it there for the time being, these Similarities should always return positive scores. I don't feel very confident about this test myself, so I guess I'll remove it (or at least make it optional) once all tests are successful.

          As for the PreFlex codec, I must admit I am not familiar with it, so I would be grateful for a few pointers.

          Show
          David Mark Nemeskey added a comment - Robert: I'm on the Nan/Inf problems. As for the negative score, I'll leave it there for the time being, these Similarities should always return positive scores. I don't feel very confident about this test myself, so I guess I'll remove it (or at least make it optional) once all tests are successful. As for the PreFlex codec, I must admit I am not familiar with it, so I would be grateful for a few pointers.
          Hide
          Robert Muir added a comment -

          Robert: I'm on the Nan/Inf problems. As for the negative score, I'll leave it there for the time being, these Similarities should always return positive scores. I don't feel very confident about this test myself, so I guess I'll remove it (or at least make it optional) once all tests are successful.

          Ahh, ok. I didn't know the sims should always return positive scores! If this is really the case, then its good to test for it.

          As for the PreFlex codec, I must admit I am not familiar with it, so I would be grateful for a few pointers.

          PreFlex codec emulates the Lucene 3.x index format, which does not support TotalTermFreq, SumTotalTermFreq, SumDocFreq, etc. It will return -1 here.
          Though I just realized: in some situations any codec can return -1 for these values, for example if frequencies are omitted by the user (omitTFAP).
          So currently, unfortunately, similarities have to deal with this case (and also the case where norms == null, because norms are omitted by the user (omitNorms) !).

          I've been working on the BM25 sim with all these regards, Ill commit an update to it as an example.

          Show
          Robert Muir added a comment - Robert: I'm on the Nan/Inf problems. As for the negative score, I'll leave it there for the time being, these Similarities should always return positive scores. I don't feel very confident about this test myself, so I guess I'll remove it (or at least make it optional) once all tests are successful. Ahh, ok. I didn't know the sims should always return positive scores! If this is really the case, then its good to test for it. As for the PreFlex codec, I must admit I am not familiar with it, so I would be grateful for a few pointers. PreFlex codec emulates the Lucene 3.x index format, which does not support TotalTermFreq, SumTotalTermFreq, SumDocFreq, etc. It will return -1 here. Though I just realized: in some situations any codec can return -1 for these values, for example if frequencies are omitted by the user (omitTFAP). So currently, unfortunately, similarities have to deal with this case (and also the case where norms == null, because norms are omitted by the user (omitNorms) !). I've been working on the BM25 sim with all these regards, Ill commit an update to it as an example.
          Hide
          Robert Muir added a comment -

          Ok, here is what i did here for BM25:

          in the case norms are omitted by the user, the formula behaves as if b=0 (no length normalization). so this is always a possibility sims should handle, thoguh for EasySimilarity perhaps it should just supply doclen=1 or something of that nature?

          in the case norms are available, but sumTotalTermFreq is not (e.g. frequencies are omitted by the user), I use a value of 1 for avg doc len... This is probably ok
          since in the case of omitTF all the TF values will be 1 anyway.

          Show
          Robert Muir added a comment - Ok, here is what i did here for BM25: in the case norms are omitted by the user, the formula behaves as if b=0 (no length normalization). so this is always a possibility sims should handle, thoguh for EasySimilarity perhaps it should just supply doclen=1 or something of that nature? in the case norms are available, but sumTotalTermFreq is not (e.g. frequencies are omitted by the user), I use a value of 1 for avg doc len... This is probably ok since in the case of omitTF all the TF values will be 1 anyway.
          Hide
          David Mark Nemeskey added a comment - - edited

          Fixed NaN and infinite scores in DFR and IB; all that's left is to fix the negative scores as well. ... and everything else discussed earlier.

          Show
          David Mark Nemeskey added a comment - - edited Fixed NaN and infinite scores in DFR and IB; all that's left is to fix the negative scores as well. ... and everything else discussed earlier.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12490039 ]
          rmuir committed 1156429 (27 files)
          Reviews: none

          LUCENE-3357: fix NaN/Inf issues in some DFR/IB models, fix IB TTF/DF confusion, add tests (some fail at the moment due to negative scores)

          Lucene flexscoring
          Hide
          Robert Muir added a comment -

          I committed this to the branch, even though we have the failing tests with negative scores, i think it will prevent the patch from becoming hellacious.

          Show
          Robert Muir added a comment - I committed this to the branch, even though we have the failing tests with negative scores, i think it will prevent the patch from becoming hellacious.
          Hide
          Robert Muir added a comment -

          Ok I added some things (marked nocommit for your review):

          Basically we have the case for norms/totalTermFreq/sumTotalTermFreq that they can be unavailable because
          freqs or norms are omitted, but currently all sims have to deal with this problem

          Ideally sims would not have to deal with this stuff, but for the time being it prevents NaN/Inf for the hearts test
          if the test gets preflexcodec (about 1/4 of the time), and it will prevent NPE if norms are omitted.

          in the case these values are unavailable i set these to "1"... if you can review that this is ok, we can nuke the nocommits.

          Show
          Robert Muir added a comment - Ok I added some things (marked nocommit for your review): Basically we have the case for norms/totalTermFreq/sumTotalTermFreq that they can be unavailable because freqs or norms are omitted, but currently all sims have to deal with this problem Ideally sims would not have to deal with this stuff, but for the time being it prevents NaN/Inf for the hearts test if the test gets preflexcodec (about 1/4 of the time), and it will prevent NPE if norms are omitted. in the case these values are unavailable i set these to "1"... if you can review that this is ok, we can nuke the nocommits.
          Hide
          Robert Muir added a comment -

          For the negative in the IF model, one solution is this:

          -    return tfn * (float)(log2((N + 1) / (F + 0.5)));
          +    return tfn * (float)(log2(1 + (N + 1) / (F + 0.5)));
          

          in quick relevance tests, this was slightly better (likely not significant either way).

          Show
          Robert Muir added a comment - For the negative in the IF model, one solution is this: - return tfn * (float)(log2((N + 1) / (F + 0.5))); + return tfn * (float)(log2(1 + (N + 1) / (F + 0.5))); in quick relevance tests, this was slightly better (likely not significant either way).
          rmuir committed 1156443 (1 file)
          Hide
          Robert Muir added a comment -

          OK I committed this, ran on 3 test collections, i was definitely getting negative scores (not crazy corner cases).
          In one case, fixing this improved MAP > 10%, so I think its important.

          Show
          Robert Muir added a comment - OK I committed this, ran on 3 test collections, i was definitely getting negative scores (not crazy corner cases). In one case, fixing this improved MAP > 10%, so I think its important.
          Hide
          David Mark Nemeskey added a comment -

          Apparently the Dirichlet method returns a negative score if the tf / docLen < corpusTf / corpusLen. Unfortunately the negative number can be arbitrarily large, so it's not as easy as adding a constant to the score. This of course makes sense if all documents are scored, as the function is monotone and consequently documents, whose tf is 0, will always be ranked lower than those that contain the word. But this is not how IR engines work.

          Having said that, I believe that we could simulate such a system. I don't know exactly how the query architecture works, but I presume the clauses that don't match a document are assigned a zero value. Now instead of this zero, the Scorer (or whatever class does this) could ask for a default value from the Similarity. In this case LMDirichletSimilarity could return score(stats, 0, Integer.MAX_VALUE), which is somewhere around -12.

          If we don't do this, we have three options:
          1. add score(stats, 0, Integer.MAX_VALUE) to the score
          2. if (score < 0) return 0
          3. add corpusTf / corpusLen * docLen to tf

          All ensure a positive score, but also each has its own disadvantage.
          1. adds a pretty big constant to the score, which may not play well with the other parts of the query
          2. some documents that contain the term get the same 0 score as documents that don't (though I cannot say this is not in line with the LM approach)
          3. this introduces a transformation that is difficult to characterize

          For the time being, I'll go with 2, but we have to discuss this.

          Show
          David Mark Nemeskey added a comment - Apparently the Dirichlet method returns a negative score if the tf / docLen < corpusTf / corpusLen. Unfortunately the negative number can be arbitrarily large, so it's not as easy as adding a constant to the score. This of course makes sense if all documents are scored, as the function is monotone and consequently documents, whose tf is 0, will always be ranked lower than those that contain the word. But this is not how IR engines work. Having said that, I believe that we could simulate such a system. I don't know exactly how the query architecture works, but I presume the clauses that don't match a document are assigned a zero value. Now instead of this zero, the Scorer (or whatever class does this) could ask for a default value from the Similarity. In this case LMDirichletSimilarity could return score(stats, 0, Integer.MAX_VALUE), which is somewhere around -12. If we don't do this, we have three options: 1. add score(stats, 0, Integer.MAX_VALUE) to the score 2. if (score < 0) return 0 3. add corpusTf / corpusLen * docLen to tf All ensure a positive score, but also each has its own disadvantage. 1. adds a pretty big constant to the score, which may not play well with the other parts of the query 2. some documents that contain the term get the same 0 score as documents that don't (though I cannot say this is not in line with the LM approach) 3. this introduces a transformation that is difficult to characterize For the time being, I'll go with 2, but we have to discuss this.
          Hide
          Robert Muir added a comment -

          heh, i fought that guy last night for quite some time... couldn't figure out a good solution.

          if you make a patch I can do some sanity testing though to try to help.

          Show
          Robert Muir added a comment - heh, i fought that guy last night for quite some time... couldn't figure out a good solution. if you make a patch I can do some sanity testing though to try to help.
          Hide
          David Mark Nemeskey added a comment -

          Fixed LMDirichletSimilarity (see my last comment).

          Show
          David Mark Nemeskey added a comment - Fixed LMDirichletSimilarity (see my last comment).
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12490113 ]
          Hide
          David Mark Nemeskey added a comment -

          Did something so that D and P (the binomial models) return only positive scores, but neither is it theoretically sound, nor do I like it much.

          Robert: could you test D please, to see how the results are affected?

          Show
          David Mark Nemeskey added a comment - Did something so that D and P (the binomial models) return only positive scores, but neither is it theoretically sound, nor do I like it much. Robert: could you test D please, to see how the results are affected?
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12490119 ]
          Hide
          David Mark Nemeskey added a comment - - edited

          Robert: I modified the nocommits a bit to provide input to the Similarities that looks somewhat plausible. I think it's better to avoid situations where e.g. docLen < freq to minimize the chance of error.

          Please let me know what you think of these modifications; if they're OK, I'll nuke the nocommits.

          Show
          David Mark Nemeskey added a comment - - edited Robert: I modified the nocommits a bit to provide input to the Similarities that looks somewhat plausible. I think it's better to avoid situations where e.g. docLen < freq to minimize the chance of error. Please let me know what you think of these modifications; if they're OK, I'll nuke the nocommits.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12490128 ]
          Hide
          Robert Muir added a comment -

          I think the change to D is fine? what about the rest of the equation? (especially the variable "D")

          I tested D and its fine with this change, however with some of the other sims the changes had some negative effect... lets figure out D for now.

          Also as far as the values if you omit stuff: i don't think we should provide fake values that seem plausible: remember if you omit term frequencies such that totalTermFreq is unavailable, then freq will always be 1

          Show
          Robert Muir added a comment - I think the change to D is fine? what about the rest of the equation? (especially the variable "D") I tested D and its fine with this change, however with some of the other sims the changes had some negative effect... lets figure out D for now. Also as far as the values if you omit stuff: i don't think we should provide fake values that seem plausible: remember if you omit term frequencies such that totalTermFreq is unavailable, then freq will always be 1
          Hide
          David Mark Nemeskey added a comment - - edited

          D: good question, I think if F > tfn, then D > 0, but I guess I have to prove it (and fix it if it isn't).

          Could you tell me which sims were affected negatively?

          freq: I didn't know about that! Still, I want to provide not "plausible", but at least "safe" statistics in this case. You didn't touch docFreq and numberOfDocuments, so I assumed at least these two are filled with the actual values, is that so?

          Show
          David Mark Nemeskey added a comment - - edited D: good question, I think if F > tfn, then D > 0, but I guess I have to prove it (and fix it if it isn't). Could you tell me which sims were affected negatively? freq: I didn't know about that! Still, I want to provide not "plausible", but at least "safe" statistics in this case. You didn't touch docFreq and numberOfDocuments, so I assumed at least these two are filled with the actual values, is that so?
          Hide
          Robert Muir added a comment -

          freq: I didn't know about that! Still, I want to provide not "plausible", but at least "safe" statistics in this case. You didn't touch docFreq and numberOfDocuments, so I assumed at least these two are filled with the actual values, is that so?

          But I don't think we should populate it with arbitrary ones, I like 1 because this is consistent with what you asked for if you omit term frequency (I think its confusing to put something other than 1 here, its inconsistent with how omitTF works for lucene's default scoring).

          right, docFreq is always populated. but if you omitTF, freq will be 1 (for exact scorers) or <= 1 (for sloppy scorers) as no frequency is available.

          I ran a quick test and got decreases in MAP (probably slight, maybe not even significant) with PL2 and dirichlet with the changes. I figure we can first fix D and then move on to P and such, save LM for last as its a major pain

          Show
          Robert Muir added a comment - freq: I didn't know about that! Still, I want to provide not "plausible", but at least "safe" statistics in this case. You didn't touch docFreq and numberOfDocuments, so I assumed at least these two are filled with the actual values, is that so? But I don't think we should populate it with arbitrary ones, I like 1 because this is consistent with what you asked for if you omit term frequency (I think its confusing to put something other than 1 here, its inconsistent with how omitTF works for lucene's default scoring). right, docFreq is always populated. but if you omitTF, freq will be 1 (for exact scorers) or <= 1 (for sloppy scorers) as no frequency is available. I ran a quick test and got decreases in MAP (probably slight, maybe not even significant) with PL2 and dirichlet with the changes. I figure we can first fix D and then move on to P and such, save LM for last as its a major pain
          Hide
          David Mark Nemeskey added a comment -

          Fixed the omit norms case.

          Show
          David Mark Nemeskey added a comment - Fixed the omit norms case.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12490247 ]
          Hide
          David Mark Nemeskey added a comment -

          I've added the correctness tests (is there a better name for these?). Do you think that I should re-write the ones where the computation of the gold value is missing? Or the other way around?

          Show
          David Mark Nemeskey added a comment - I've added the correctness tests (is there a better name for these?). Do you think that I should re-write the ones where the computation of the gold value is missing? Or the other way around?
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12490868 ]
          Hide
          Robert Muir added a comment -

          Do you think that I should re-write the ones where the computation of the gold value is missing? Or the other way around?

          I don't think so, i think we will take whatever we can get as far as tests I would just shoot for 'breadth' as far as across the different sims?

          Show
          Robert Muir added a comment - Do you think that I should re-write the ones where the computation of the gold value is missing? Or the other way around? I don't think so, i think we will take whatever we can get as far as tests I would just shoot for 'breadth' as far as across the different sims?
          Hide
          David Mark Nemeskey added a comment - - edited

          I would just shoot for 'breadth' as far as across the different sims?

          What do you mean by 'breadth'? Unit and integration tests (well... the "heart" test) already cover all the sims, and this includes score vs explanation comparison. As for the correctness tests, both LM and IB sims are tested, as well as four DFR methods. I can write tests for the three missing DFR sims, but that is as much breadth as I can add. Or do you have something else in mind?

          Show
          David Mark Nemeskey added a comment - - edited I would just shoot for 'breadth' as far as across the different sims? What do you mean by 'breadth'? Unit and integration tests (well... the "heart" test) already cover all the sims, and this includes score vs explanation comparison. As for the correctness tests, both LM and IB sims are tested, as well as four DFR methods. I can write tests for the three missing DFR sims, but that is as much breadth as I can add. Or do you have something else in mind?
          Hide
          Robert Muir added a comment -

          I can write tests for the three missing DFR sims, but that is as much breadth as I can add. Or do you have something else in mind?

          That sounds good!

          Show
          Robert Muir added a comment - I can write tests for the three missing DFR sims, but that is as much breadth as I can add. Or do you have something else in mind? That sounds good!
          Hide
          David Mark Nemeskey added a comment -

          Correctness tests added for the rest of the DFR sims.

          Show
          David Mark Nemeskey added a comment - Correctness tests added for the rest of the DFR sims.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12491046 ]
          Hide
          David Mark Nemeskey added a comment -

          Robert: with this, all EasySimilarity-based classes have been tested. Do you think we could close this issue?

          Show
          David Mark Nemeskey added a comment - Robert: with this, all EasySimilarity-based classes have been tested. Do you think we could close this issue?
          Hide
          David Mark Nemeskey added a comment -

          Ah, I forgot to modify the explain() methods to handle the omitted norms case in the same way as score(). Fixed it now.

          Show
          David Mark Nemeskey added a comment - Ah, I forgot to modify the explain() methods to handle the omitted norms case in the same way as score(). Fixed it now.
          David Mark Nemeskey made changes -
          Attachment LUCENE-3357.patch [ 12491049 ]
          Hide
          Robert Muir added a comment -

          I think we must be very close: I just need to review this patch and lets get it committed and close the issue.

          Show
          Robert Muir added a comment - I think we must be very close: I just need to review this patch and lets get it committed and close the issue.
          Hide
          Robert Muir added a comment -

          great work!

          These tests were very effective at finding problems in these formulas

          Show
          Robert Muir added a comment - great work! These tests were very effective at finding problems in these formulas
          Robert Muir made changes -
          Status Open [ 1 ] Resolved [ 5 ]
          Resolution Fixed [ 1 ]
          Gavin made changes -
          Link This issue depends on LUCENE-3220 [ LUCENE-3220 ]
          Gavin made changes -
          Link This issue depends upon LUCENE-3220 [ LUCENE-3220 ]

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            • Assignee:
              David Mark Nemeskey
              Reporter:
              David Mark Nemeskey
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