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Structural variant comparison tool for VCFs
Given benchmark and comparsion sets of SVs, calculate the recall, precision, and f-measure.
Truvari uses Python 2 or 3 and requires the following modules:
$ pip install pyvcf python-Levenshtein intervaltree progressbar2 pysam pyfaidx
$ ./truvari.py -b base_calls.vcf -c compare_calls.vcf -o output_dir/
- tp-call.vcf -- annotated true positive calls from the COMP
- tp-base.vcf -- anotated true positive calls form the BASE
- fn.vcf -- false negative calls from BASE
- fp.vcf -- false positive calls from COMP
- base-filter.vcf -- size filtered calls from BASE
- call-filter.vcf -- size filtered calls from COMP
- summary.txt -- json output of performance stats
- log.txt -- run log
- giab_report.txt -- (optional) Summary of GIAB benchmark calls. See below for details.
Input: BaseCall - Benchmark TruthSet of SVs CompCalls - Comparison SVs from another program Build IntervalTree of CompCalls For each BaseCall: Fetch CompCalls overlapping within *refdist*. If typematch and LevDistRatio >= *pctsim* \ and SizeRatio >= *pctsize* and PctRecOvl >= *pctovl*: Add CompCall to list of Neighbors Sort list of Neighbors by TruScore ((2*sim + 1*size + 1*ovl) / 3.0) Take CompCall with highest TruScore and BaseCall as TPs Only use a CompCall once if --multimatch If no neighbors: BaseCall is FN For each CompCall: If not used: mark as FP
|refdist||500||Maximum distance comparison calls must be within from base call's start/end|
|pctsim||0.7||Levenshtein distance ratio between the REF or ALT sequence of base and comparison call. Longer sequence of the two is used.|
|pctsize||0.7||Ratio of min(base_size, comp_size)/max(base_size, comp_size)|
|pctovl||0.0||Ratio of two calls' (overlapping bases)/(longest span)|
|typeignore||False||Types don't need to match to compare calls.|
Comparing VCFs without sequence resolved calls
If the base or comp vcfs do not have sequence resolved calls, simply set
--pctsim=0 to turn off
Difference between --sizemin and --sizefilt
--sizemin is the minimum size of a base call or comparison call to be considered.
--sizefilt is the minimum size of a call to be added into the IntervalTree for searching. It should
be less than
sizemin for edge case variants.
sizemin is 50 and
sizefilt is 30. A 50bp base call is 98% similar to a 49bp call at
the same position.
These two calls should be considered matching. If we instead removed calls less than
incorrectly classify the 50bp base call as a false negative.
This does have the side effect of artificially inflating specificity. If that same 49bp call in the
above were below the similarity threshold, it would not be classified as a FP due to the
threshold. So we're giving the call a better chance to be useful and less chance to be detrimental
to final statistics.
Definition of annotations added to TP vcfs
|TruScore||Truvari score for similarity of match. `((2*sim + 1*size + 1*ovl) / 3.0)`|
|PctSeqSimilarity||Pct sequence similarity between this variant and its closest match|
|PctSizeSimilarity||Pct size similarity between this variant and it's closest match|
|PctRecOverlap||Percent reciprocal overlap of the two calls' coordinates|
|StartDistance||Distance of this call's start from matching call's start|
|EndDistance||Distance of this call's end from matching call's end|
|SizeDiff||Difference in size(basecall) and size(compcall)|
|NumNeighbors||Number of comparison calls that were in the neighborhood (REFDIST) of the base call|
|NumThresholdNeighbors||Number of comparison calls that passed threshold matching of the base call|
NumNeighbors and NumThresholdNeighbors are also added to the FN vcf.
Using the GIAB Report
When running against the GIAB SV v0.5 benchmark (link below), you can create a detailed report of calls summarized by the GIAB VCF's SVTYPE, SVLEN, Technology, and Repeat annotations.
To create this report.
- Run Truvari with the flag
- In your output directory, you will find a file named
- Next, make a copy of the Truvari Report Template Google Sheet.
- Finally, paste ALL of the information inside
giab_report.txtinto the "RawData" tab. Be careful not to alter the report text in any way. If successul, the "Formatted" tab you will have a fully formated report.
This currently only works with GIAB SV v0.5. Work will need to be done to ensure Truvari can parse future GIAB SV releases.
Include Bed & VCF Header Contigs
--includebed is provided, only base and comp calls contained within the defined regions are used
for comparison. This is similar to pre-filtering your base/comp calls with:
(zgrep "#" my_calls.vcf.gz && bedtools intersect -u -a my_calls.vcf.gz -b include.bed) | bgzip > filtered.vcf.gz
with the exception that Truvari requires the start and the end to be contained in the same includebed region
bedtools intersect does not.
--includebed is not provided, the comparison is restricted to only the contigs present in the base VCF
header. Therefore, any comparison calls on contigs not in the base calls will not be counted toward summary
statistics and will not be present in any output vcfs.
Comparing Haplotype Sequences of Variants
To compare the sequence similarity, biuld the haplotypes over the range of min(call starts)-max(call ends) and build the sequence change from the variants. For example:
hap1_seq = ref.get_seq(a1_chrom, start + 1, a1_start).seq + a1_seq + ref.get_seq(a1_chrom, a1_end + 1, end).seq
a1_seq1 is the longer of the REF or ALT allele.
Find more details and discussions about Truvari on the WIKI page.