AMBER: Assessment of Metagenome BinnERs

AMBER is an evaluation package for the comparative assessment of genome reconstructions and taxonomic assignments from metagenome benchmark datasets. It provides performance metrics, results rankings, and comparative visualizations for assessing multiple programs or parameter effects. The provided metrics were used in the first community benchmarking challenge of the initiative for the Critical Assessment of Metagenomic Interpretation.

Metrics computed per bin

Predicted bin size in bps and sequences
True positives
(Average) Purity
(Average) Completeness

Metrics computed per sample

Accuracy
Misclassification rate (contamination)
Purity
Completeness
(Adjusted) Rand index
Percentage of binned base pairs and sequences
Number of genomes recovered within levels of completeness and contamination
UniFrac (for taxonomic binning)

Example pages produced by AMBER

Installation

Requirements

AMBER requires Python 3.7.

See default.txt for all dependencies.

Steps

You can run AMBER using Docker (see below) or install it as follows.

Install pip if not already installed (tested on Linux Ubuntu 18.04):

sudo apt install python3-pip

Should you receive the message Unable to locate package python3-pip, enter the following commands and repeat the previous step.

sudo add-apt-repository universe
sudo apt update

Then run:

pip3 install cami-amber

Make sure to add AMBER to your PATH:

echo 'PATH=$PATH:${HOME}/.local/bin' >> ~/.bashrc
source ~/.bashrc

User guide

Input

As input, AMBER uses three files and an additional file for assessing taxonomic binning:

A gold standard mapping of contigs or read IDs to genomes and/or taxon IDs in the CAMI binning Bioboxes format. Columns are tab separated. Example:

@Version:0.9.1
@SampleID:gsa

@@SEQUENCEID BINID      TAXID  LENGTH
RH|P|C37126  Sample6_89 45202  25096
RH|P|C3274   Sample9_91 32644  10009
RH|P|C26099  1053046    765201 689201
RH|P|C35075  1053046    765201 173282
RH|P|C20873  1053046    765201 339258

See here another example. Observations:

The value of the SampleID header tag must uniquely identify a sample and be the same in the gold standard and the predictions (input 2 below).
Column BINID (TAXID) is required to assess genome (taxonomic) binning.
Column _LENGTH can be added to a mapping file using tool src/utils/add_length_column.py.

One or more files, each containing the bin assignments from a binning program, also in the CAMI binning Bioboxes format. Column _LENGTH is not required (_LENGTH is only required in the gold standard).

Note: a tool for converting FASTA files, such that each file represents a bin, is available (see src/utils/convert_fasta_bins_to_biobox_format.py).

For assessing taxonomic binning, AMBER also requires the file nodes.dmp from NCBI. Download taxdump.tar.gz from ftp://ftp.ncbi.nih.gov/pub/taxonomy/taxdump.tar.gz, extract nodes.tmp, and provide it to AMBER with option --ncbi_nodes_file.

Input format for multiple samples

Binnings of datasets with multiple samples are supported by AMBER. For each binning program, simply concatenate the binnings of the different samples into a single file to obtain one binning file per program. The gold standard must also consist in one file for all samples. Remember: binnings for the same sample must have the same SampleID.

Running amber.py

usage: AMBER [-h] -g GOLD_STANDARD_FILE [-l LABELS] [-p FILTER]
             [-n MIN_LENGTH] -o OUTPUT_DIR [--stdout] [-d DESC] [--silent]
             [-v] [-m] [-x MIN_COMPLETENESS] [-y MAX_CONTAMINATION] [-c]
             [-r REMOVE_GENOMES] [-k KEYWORD]
             [--ncbi_nodes_file NCBI_NODES_FILE]
             [--ncbi_names_file NCBI_NAMES_FILE]
             [--rank_as_genome_binning RANK_AS_GENOME_BINNING]
             bin_files [bin_files ...]

AMBER: Assessment of Metagenome BinnERs

positional arguments:
  bin_files             Binning files

optional arguments:
  -h, --help            show this help message and exit
  -g GOLD_STANDARD_FILE, --gold_standard_file GOLD_STANDARD_FILE
                        Gold standard - ground truth - file
  -l LABELS, --labels LABELS
                        Comma-separated binning names
  -p FILTER, --filter FILTER
                        Filter out [FILTER]% smallest genome bins (default: 0)
  -n MIN_LENGTH, --min_length MIN_LENGTH
                        Minimum length of sequences
  -o OUTPUT_DIR, --output_dir OUTPUT_DIR
                        Directory to write the results to
  --stdout              Print summary to stdout
  -d DESC, --desc DESC  Description for HTML page
  --silent              Silent mode
  -v, --version         show program's version number and exit

genome binning-specific arguments:
  -m, --map_by_completeness
                        Map genomes to bins by maximizing completeness
  -x MIN_COMPLETENESS, --min_completeness MIN_COMPLETENESS
                        Comma-separated list of min. completeness thresholds
                        (default %: 50,70,90)
  -y MAX_CONTAMINATION, --max_contamination MAX_CONTAMINATION
                        Comma-separated list of max. contamination thresholds
                        (default %: 10,5)
  -c, --plot_heatmaps   Plot heatmaps of confusion matrices (can take some
                        minutes)
  -r REMOVE_GENOMES, --remove_genomes REMOVE_GENOMES
                        File with list of genomes to be removed
  -k KEYWORD, --keyword KEYWORD
                        Keyword in the second column of file with list of
                        genomes to be removed (no keyword=remove all genomes
                        in list)

taxonomic binning-specific arguments:
  --ncbi_nodes_file NCBI_NODES_FILE
                        NCBI nodes file
  --ncbi_names_file NCBI_NAMES_FILE
                        NCBI names file
  --rank_as_genome_binning RANK_AS_GENOME_BINNING
                        Assess taxonomic binning at a rank also as genome
                        binning. Valid ranks: superkingdom, phylum, class,
                        order, family, genus, species, strain

Example:

amber.py -g test/gsa_mapping.binning \
-l "MaxBin 2.0, CONCOCT, MetaBAT" \
-p 1 \
-r test/unique_common.tsv \
-k "circular element" \
test/naughty_carson_2 \
test/goofy_hypatia_2 \
test/elated_franklin_0 \
-o output_dir/

Running amber.py using Docker

Download or git-clone AMBER from GitHub. In AMBER's directory, build the Docker image with the command:

docker build -t amber:latest .

amber.py can then be run with the docker run command. Example:

docker run -v /path/to/AMBER/test:/host amber:latest \
amber.py \
-l "CONCOCT (CAMI), MaxBin 2.0.2 (CAMI)" \
-p 1 \
-r /host/unique_common.tsv \
-k "circular element" \
-g /host/gsa_mapping.binning \
/host/goofy_hypatia_2 \
/host/naughty_carson_2 \
-o /host/output_dir

Utilities

src/utils/add_length_column.py

Adds column _LENGTH to the gold standard mapping file, eliminating the need to provide a FASTA or FASTQ file to amber.py.

usage: add_length_column.py [-h] -g GOLD_STANDARD_FILE -f FASTA_FILE

Add length column _LENGTH to gold standard mapping and print mapping on the
standard output

optional arguments:
  -h, --help            show this help message and exit
  -g GOLD_STANDARD_FILE, --gold_standard_file GOLD_STANDARD_FILE
                        Gold standard - ground truth - file
  -f FASTA_FILE, --fasta_file FASTA_FILE
                        FASTA or FASTQ file with sequences of gold standard

Example: File CAMI_low_RL_S001__insert_270_GoldStandardAssembly.fasta.gz used in the example can be downloaded here.

python3 src/utils/add_length_column.py -g test/gsa_mapping.binning \
-f test/CAMI_low_RL_S001__insert_270_GoldStandardAssembly.fasta.gz

Output:

@Version:0.9.1
@SampleID:gsa

@@SEQUENCEID BINID           LENGTH
RL|S1|C10817 Sample18_57     20518
RL|S1|C11497 Sample22_57     37672
RL|S1|C6571  evo_1286_AP.033 69914
RL|S1|C10560 evo_1286_AP.033 995657
...

src/utils/convert_fasta_bins_to_biobox_format.py

usage: convert_fasta_bins_to_biobox_format.py [-h] [-o OUTPUT_FILE]
                                              paths [paths ...]

Convert bins in FASTA files to CAMI tsv format

positional arguments:
  paths                 FASTA files including full paths

optional arguments:
  -h, --help            show this help message and exit
  -o OUTPUT_FILE, --output_file OUTPUT_FILE
                        Output file

Example:

python3 src/utils/convert_fasta_bins_to_cami.py \
/path/to/file/maxbin.out.001.fasta \
/path/to/file/maxbin.out.002.fasta \
/path/to/file/maxbin.out.003.fasta \
/path/to/file/maxbin.out.004.fasta \
/path/to/file/maxbin.out.005.fasta \
-o bins.tsv

Alternatively:

python3 src/utils/convert_fasta_bins_to_cami.py /path/to/file/maxbin.out.0* -o bins.tsv

Output: File bins.tsv is created in the working directory.

Developer guide

We are using tox for project automation.

Tests

If you want to run tests, just type tox in the project's root directory:

tox

You can use all libraries that AMBER depends on by activating tox's virtual environment with the command:

source  <project_directory>/.tox/py37/bin/activate

Update GitHub page

In order to update https://cami-challenge.github.io/AMBER, modify file index.html.

Make a release

If the dev branch is merged into the master branch:

Update version.py according to semantic versioning on the dev branch.
Merge the dev branch into the master branch.
Make a release on GitHub with the same version number provided in version.py .
Create package and upload it to PyPI:

python3 setup.py sdist bdist_wheel
twine upload dist/*

Citation

Please cite AMBER as:

Fernando Meyer, Peter Hofmann, Peter Belmann, Ruben Garrido-Oter, Adrian Fritz, Alexander Sczyrba, and Alice C. McHardy. (2018). AMBER: Assessment of Metagenome BinnERs. GigaScience, giy069. doi:10.1093/gigascience/giy069

The metrics implemented in AMBER were used and described in the CAMI manuscript, thus you may also cite:

Sczyrba, Hofmann, Belmann, et al. (2017). Critical Assessment of Metagenome Interpretation—a benchmark of metagenomics software. Nature Methods, 14, 11:1063–1071. doi:10.1038/nmeth.4458

License

AMBER 2 is licensed under GPL v3.

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