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HolobiomicsLab

@holobiomicslab source repo

7377 published skills · page 46 of 74

  1. Regression Model Training Comparison · holobiomicslab
    Use when you have a labeled dataset of molecular structures with experimental continuous outcomes (e.
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  2. Retention Time Mz Alignment Matching · holobiomicslab
    Use when you have extracted feature tables (m/z, intensity, retention time) from multiple breath samples (mzML or mzXML files) via feature extraction, and need to identify which features represent the same volatile organic compound (VOC) across samples to enable cross-sample intensity comparisons.
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  3. Retention Time Mz Coordinate Mapping · holobiomicslab
    Use when when you have mass-spectrometry data in tabular form (Pandas DataFrame) with columns for m/z, retention time or ion mobility, and intensity, and you need to visualize the 2D distribution of peaks to assess peak separation, detect co-elution, or examine chromatographic and mass resolution.
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  4. Retention Time Mz Feature Extraction · holobiomicslab
    Use when you have LC-HRMS profile-mode data (e.g., netCDF or mzML format) and need to convert detected or reference chromatographic peaks into fixed-size 2D arrays (rt × mz regions) to train or apply a convolutional neural network for peak classification and bounding-box prediction.
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  5. Rust Library Compilation And Testing · holobiomicslab
    Use when when you have access to Rust source code in a repository with a Cargo manifest (Cargo.toml) and need to verify that a library's read and write APIs produce byte-equivalent or structurally equivalent output.
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  6. Self Contained Pipeline Construction · holobiomicslab
    Use when when you have metabolomics datasets (loaded as SummarizedExperiment objects) and need to apply a sequence of data-processing and analytical steps (e.
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  7. Smiles String Parsing And Validation · holobiomicslab
    Use when when you have SMILES strings as input to a molecular machine learning pipeline (e.g., retention time prediction, spectral prediction) and need to convert them into structured molecular representations before calculating descriptors or constructing molecular graphs.
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  8. Sparse Inverse Covariance Estimation · holobiomicslab
    Use when when you have a feature matrix (samples × features) and need to infer sparse conditional dependencies among features—particularly when the number of features is comparable to or exceeds sample size, and you want to identify which features are directly related after accounting for all.
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  9. Spatial Spot Coordinate Registration · holobiomicslab
    Use when when you have paired spatial transcriptome and metabolome datasets with spot-based coordinates that need to be aligned for multi-modal integration.
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  10. Spectral Database Search And Scoring · holobiomicslab
    Use when you have preprocessed mass spectrometry data (peak-picked, baseline-corrected) from DI-MS, ASAP-MS, or LDI-MS instruments and need to identify unknown samples by comparing their spectral fingerprints against a validated reference database of known species or compounds.
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  11. Spectral Ion Matching Across Vendors · holobiomicslab
    Use when you have raw line-scan MSI data from any supported vendor (Agilent .d, Bruker .tsf/.baf/.tdf, Thermo .raw, or .
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  12. Spectral Peak Parent Product Pairing · holobiomicslab
    Use when you have mass spectrometry imaging data with a histogram of pairwise mass differences that have already been matched to known adducts (via adductMatch), and you need to retrieve the actual mass peak pairs corresponding to a specific adduct of interest—particularly when you want to test.
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  13. Spectral Smoothing Method Comparison · holobiomicslab
    Use when when you have raw mass spectra in an MSImagingArrays object and need to decide between Savitzky-Golay and Gaussian smoothing methods based on their effects on peak shape fidelity and baseline noise. Apply this skill when peak preservation is a priority (e.
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  14. Spike Artifact Detection And Removal · holobiomicslab
    Use when processing raw IM-MS data (Agilent MassHunter .d or UIMF format) that exhibits isolated high-intensity noise artifacts or instrumental artifacts that appear as discrete, non-continuous signals in the retention time, ion mobility, or m/z dimensions.
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  15. Stochastic Weight Averaging Ensemble · holobiomicslab
    Use when training a heavily regularized deep neural network on molecular property prediction tasks (e.g., retention time prediction) where you observe signs of overfitting despite L1/L2 penalties, or when you need to reduce variance in predictions on held-out test sets.
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  16. Strain Correlation Score Computation · holobiomicslab
    Use when when you have paired genomics and metabolomics data from multiple strains (e.g., from Paired Omics Data Platform), have clustered BGCs into GCFs and detected molecular features, and need to score all potential GCF–MF links to prioritise true biosynthetic relationships.
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  17. Structure Standardization Validation · holobiomicslab
    Use when you have raw or heterogeneous molecular structure inputs (SMILES strings or SDF files) that will be used for fingerprint calculation, descriptor extraction, or retention time prediction modeling.
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  18. Tensorflow Model Metadata Inspection · holobiomicslab
    Use when deploying a TensorFlow model through TensorFlow Serving and you need to verify that the exposed model's input layer names ('input_2048' and 'input_4096') and output layer name ('output') match the specifications required by downstream code.
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  19. Training Convergence Loss Monitoring · holobiomicslab
    Use when executing a multi-stage deep learning pipeline (pretraining → fine-tuning → alignment) where each stage loads a checkpoint from the previous stage and you need to confirm that loss is decreasing monotonically within each stage, that checkpoints are being saved, and that no training.
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  20. Variance Stabilization Normalization · holobiomicslab
    Use when after k-nearest neighbor imputation (cutoff ≥0.6 data retention) and outlier sample removal have been completed on your MultiAssayExperiment object.
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  21. Web Application Server Logic Mapping · holobiomicslab
    Use when you are wrapping an existing R package or analytical library in a web interface and need to connect UI form inputs (file uploads, parameter selections, configuration checkboxes) to the backend computation functions and render their outputs reactively.
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  22. XML Spectrum Element Deserialization · holobiomicslab
    Use when when you have retrieved a decompressed XML data block from an indexed gzip file (via GSGR bracket notation) and need to convert that raw XML string into a usable Python spectrum or chromatogram object for downstream analysis, filtering, or comparison.
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  23. Graph Builder Subclassing Squidpy · holobiomicslab
    Use when you have spatial molecular data (e.g., coordinates from microscopy or sequencing assays stored in an AnnData object), you need to compute a k-nearest-neighbor graph for spatial statistics (e.
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  24. Moderated T Statistic Computation · holobiomicslab
    Use when you have a fitted linear model (lmFit object) from microarray, RNA-seq, qPCR, or proteomics data and need to test for differential expression across genes while maintaining statistical stability despite having few biological replicates or arrays.
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  25. Rna Seq Abundance Matrix Handling · holobiomicslab
    Use when you have transcript-level quantification output files (quant.sf, quant.gz) from salmon, kallisto, sailfish, or oarfish and need to produce gene-level count matrices, abundance matrices, and length-based offsets for differential expression analysis in DESeq2, edgeR, or limma-voom.
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  26. Rna Seq Quantification Validation · holobiomicslab
    Use when you have quantification output from two versions or implementations of the same tool (e.g., C++ vs. Rust rewrites, pre- and post-bugfix releases) and need to verify that they produce equivalent results before deploying the new version.
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  27. Sam Bam Mapping Record Inspection · holobiomicslab
    Use when after quantifying the same read set with two versions of a mapping/quantification tool (e.g., C++ salmon 1.11.
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  28. Sam Record Parsing And Validation · holobiomicslab
    Use when salmon quant is run with the --writeMappings/-z flag and you need to verify that all mapped reads appear in the SAM output file.
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  29. Single Cell Rna Seq Normalization · holobiomicslab
    Use when immediately after loading raw single-cell gene expression count matrices (AnnData objects) and before identifying highly variable genes or performing dimensionality reduction.
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  30. Sparse Matrix Csr Format Assembly · holobiomicslab
    Use when when you have computed k-nearest neighbor indices and distances (e.
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  31. Spatial Statistics Interpretation · holobiomicslab
    Use when when you have a spatial molecular dataset (e.g., Visium, MERFISH) with categorical cell-type or feature annotations and want to test whether specific categories are preferentially located near or away from each other in tissue space, beyond what random spatial distribution would predict.
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  32. Statistical Ranking Wilcoxon Test · holobiomicslab
    Use when when you have leiden or louvain cluster assignments in single-cell data (stored in adata.obs) and need to identify cluster-specific marker genes.
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  33. Temporal Gene Expression Dynamics · holobiomicslab
    Use when you have time-ordered gene expression data (e.
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  34. Transcript Level Abundance Import · holobiomicslab
    Use when you have transcript-level quantification files (quant.sf.gz or quant.gz) from salmon, sailfish, kallisto, or oarfish and need to aggregate them into gene-level or transcript-level count, abundance, and length matrices for input to DESeq2, edgeR, or limma-voom.
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  35. Chemical Annotation Matrix Construction · holobiomicslab
    Use when you have selected a subset of public tandem MS files from ReDU/MassIVE that have been processed through GNPS spectral library matching, and you need to organize their chemical annotations into a matrix (rows = files, columns = annotated features) before performing PCA or other multivariate.
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  36. Electron Ionization Spectral Comparison · holobiomicslab
    Use when you have a query electron ionization (EI) mass spectrum in msp format and wish to identify it by matching against a reference spectral library. Apply this skill when you need ranked similarity scores between the query and each library entry to prioritize candidate identifications.
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  37. Ms Spectra Extraction And Preprocessing · holobiomicslab
    Use when you have raw LC-MS/MS data in mzML or mzXML format and need to: (1) identify the top-abundance MS1 signals in an LC run, (2) compute a single scalar metric (separation efficiency) that summarizes how well compounds are resolved across the chromatogram, and (3) feed that metric into a.
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  38. Parameter Driven Preprocessing Pipeline · holobiomicslab
    Use when you have converted mass spectrometry data in mzXML or mzML format and need to extract metabolic features via region-of-interest (ROI) search followed by preprocessing and augmentation.
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  39. Reconstruction Algorithm Implementation · holobiomicslab
    Use when when you have raw or preprocessed mass spectrometry data (feature matrices or transient files) acquired at lower mass resolution or with signal degradation, and you possess high-resolution reference MSI data or simulated ground truth to train a reconstruction model.
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  40. Analyte Discrimination Machine Learning · holobiomicslab
    Use when you have raw chromatography–mass spectrometry data (GC-MS or LC-MS) in 2D m/z–retention time format and need to identify and discriminate multiple analytes while avoiding false peak detections inherent in conventional peak picking.
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  41. Baseline Correction Algorithm Selection · holobiomicslab
    Use when when you have imported a raw GCxGC-MS chromatogram as a 2D-TIC (2D Total Intensity Chromatogram) object from a NetCDF file and observe steady or increasing baseline intensity caused by instrumental contamination, column bleeding, or thermal drift.
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  42. Chromatographic Modality Classification · holobiomicslab
    Use when when ingesting raw or vendor-format mass spectrometry data files of unknown or mixed acquisition modality, and you need to automatically determine whether the input originated from liquid chromatography (LC), gas chromatography (GC), ion mobility spectrometry (IMS), or MS imaging (e.
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  43. Chromatographic Peak Overlap Resolution · holobiomicslab
    Use when analyzing GC-MS data containing overlapping chromatographic peaks—a common scenario in untargeted metabolomics and environmental screening where sample complexity or chromatographic resolution limitations cause co-elution of structurally similar or temporally proximate compounds.
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  44. Chromatographic Retention Time Matching · holobiomicslab
    Use when you have GC-MS data with multiple replicate injections or samples, need to identify a predefined set of query chemicals by name, and want to consolidate all instances of those chemicals (which may appear with varying match factors or peak areas across different samples or injection.
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  45. Ei Spectral Library Parsing And Merging · holobiomicslab
    Use when you need to build a comprehensive EI spectral reference library for GC-MS compound identification in MS-DIAL, starting from raw downloads of NIST, RIKEN, MoNA, or SWGDRUG libraries that have inconsistent metadata organization (SMILES in different fields or absent, RI values missing or.
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  46. Injection Order Direction Specification · holobiomicslab
    Use when when configuring a multi-well plate design (96-well, 384-well, or other format) in InjectionDesign for LC/GC-MS analysis and you need to specify whether analytical samples and QC controls should be injected row-by-row or column-by-column.
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  47. Mass Error And Retention Time Alignment · holobiomicslab
    Use when when processing low- or high-resolution mass spectrometry data (mzML profile or centroided format) for isotopologue quantification and you need to match detected peaks to a targeted formulaTable of compounds.
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  48. Mass Spectrometry Spectrum Tokenization · holobiomicslab
    Use when you have pre-processed MS/MS spectra and need to prepare them for word-embedding-based similarity methods (e.g., Spec2Vec).
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  49. Mass Spectrum Extraction And Formatting · holobiomicslab
    Use when you have raw GC-MS data in netCDF or vendor-specific binary format and need to separate co-eluting compounds and extract clean mass spectra for each individual chemical component prior to molecular networking, spectral matching, or metabolite identification workflows.
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  50. Multi Dimensional Sample Stratification · holobiomicslab
    Use when you have a parsed sample list with metadata (sample IDs, classification dimensions, QC designations) and need to generate a physical injection-plate layout that (1) will be run across multiple batches, (2) has a known confounding dimension (e.
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  51. Neutral Loss Calculation From Precursor · holobiomicslab
    Use when when converting MS/MS spectra into spectral documents for Spec2Vec embedding, and you want to capture chemical relationships implicit in the fragmentation pattern (e.g., loss of water, ammonia, or CO2) that may correlate with structural similarity. Use this when the neutral loss range (5.
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  52. Peak Integration Parameter Optimization · holobiomicslab
    Use when after peak detection and clustering have been completed on aligned and baseline-corrected GC-IMS data, and before imputation or statistical analysis.
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  53. Retention Index Calibration Application · holobiomicslab
    Use when when processing GC-MS data where retention time alone is insufficient for compound identification due to instrument drift or method variation, and you need to match detected peaks against a spectral library (e.
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  54. Retention Time Alignment Across Batches · holobiomicslab
    Use when you have extracted peaks from multiple LC/HRMS batches (n > 500 samples across different analytical runs or days) and observe systematic retention time drift or offset between batches, preventing reliable cross-batch peak matching on m/z and RT alone.
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  55. Separation Technique Workflow Alignment · holobiomicslab
    Use when when evaluating whether an MS data processing platform (such as mzmine) supports the full range of separation/ionization techniques your laboratory uses, or when assessing whether gaps exist in the software architecture that would require external pre- or post-processing for specific.
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  56. Signal Acquisition Error Quantification · holobiomicslab
    Use when you have processed the same GC–MS dataset (m/z vs retention time) through two independent signal acquisition pipelines and need to compute and compare their detection accuracy. Use this skill when one method (e.
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  57. Spectral Similarity Scoring Computation · holobiomicslab
    Use when you have a query spectrum (or set of query spectra) and need to rank candidate library spectra by their likelihood of sharing the same chemical structure.
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  58. Aif Spectrum Fragment Database Matching · holobiomicslab
    Use when you have a feature table from untargeted LC–MS all-ion fragmentation (AIF) chromatograms processed by xcms and RamClustR, and you want to assign metabolite annotations to individual features by comparing their experimental MS/MS spectra against curated fragment libraries (e.
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  59. Bipartite Graph Maximum Weight Matching · holobiomicslab
    Use when you have two MS/MS fragmentation spectra with fragment ion lists and computed pairwise mass differences (m/z deltas) between them, and you need to find the alignment of ion pairs that: (1) does not reuse any ion from either spectrum, (2) maximizes total matching quality (e.
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  60. Candidate Metadata Record Serialization · holobiomicslab
    Use when after computing InChIKey and neighbourhood scores for library match candidates, you need to write results to a persistent format (CSV, JSON, or database) for storage, sharing, and interpretation.
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  61. Changelog Maintenance And Documentation · holobiomicslab
    Use when you have added or modified user-facing parameters to a model class (such as L1/L2 regularization in SiameseModel), written unit tests to verify the new functionality, and need to communicate these changes to users and maintain a historical record.
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  62. Chemical Structure Annotation Retrieval · holobiomicslab
    Use when you have MS/MS spectra from public repositories (e.g., GNPS) that lack chemical structure annotations (InChI/SMILES), or have incomplete/inconsistent annotations.
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  63. Chromatogram Peak Matching Registration · holobiomicslab
    Use when you have multiple LC-MS samples in mzML or mzXML format with variable retention times, at least one designated as a quality control (QC) reference file, and you need to correct for RT drift before peak/feature detection.
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  64. Chromatographic Peak Quality Assessment · holobiomicslab
    Use when when you have a feature table (CSV with m/z and retention time columns) and corresponding LC-MS raw data files (.mzXML or .mzML) from an untargeted metabolomics experiment, and need to filter out spurious peaks before downstream statistical or biological interpretation.
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  65. Chunk Wise Data Processing Optimization · holobiomicslab
    Use when you have a large mass spectrometry dataset stored across multiple mzML, mzXML, or CDF files and need to perform operations (e.g., normalization, filtering, feature extraction) on the full dataset but memory constraints prevent loading all peak data simultaneously.
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  66. CLI Invocation With File Path Arguments · holobiomicslab
    Use when you have vendor raw mass spectrometry data files (e.g., .raw, .d, .wiff2 formats) that must be converted to mzML or Aird format, and you need to automate the conversion in a batch workflow, Docker container, or non-interactive environment.
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  67. Collision Cross Section Calibration Ccs · holobiomicslab
    Use when when you have acquired ion mobility–mass spectrometry data (drift time and m/z dimensions) and need to convert observed drift times into calibrated CCS values.
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  68. Computational Environment Configuration · holobiomicslab
    Use when at the start of any DaDIA pipeline execution, or whenever you are preparing to run a complex multi-package R workflow on a new system or after updating package managers.
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  69. Conformer Ensemble Generation Via Crest · holobiomicslab
    Use when you have a molecular geometry (XYZ format) and need to explore its conformational space prior to quantum mechanical property calculation or when QCxMS2 workflow requires an ensemble of low-energy structures to enable systematic fragmentation pathways for EI mass spectrum simulation.
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  70. Consensus Classification Reconciliation · holobiomicslab
    Use when you have spectral features annotated by both in silico structural prediction tools (e.g., SIRIUS/CANOPUS) and spectral library matching (GNPS), and you need a single authoritative chemical classification per feature rather than a list of competing candidates.
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  71. Correlation Cluster Network Integration · holobiomicslab
    Use when after identifying structural clusters (isotopologue groups, adduct groups, and cross-assay links) and assigning features to correlation clusters via hierarchical clustering.
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  72. Cross Dataset Generalization Assessment · holobiomicslab
    Use when you have a pre-trained MS/MS spectral embedding model evaluated on one or more source datasets (GNPS, MoNA, MTBLS1572) and need to verify that it performs well on independent, high-quality curated spectral libraries to claim robustness.
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  73. Cross Language Interface Implementation · holobiomicslab
    Use when you have a mature R analysis pipeline (e.g., using Spectra objects for MS data) but need access to specialized algorithms or calculations available only in Python libraries (e.g., CosineGreedy similarity from matchms).
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  74. CSV Serialization For Mass Spectrometry · holobiomicslab
    Use when you have generated or curated a lipid spectral library (with precursor m/z, adduct information, charge states, retention times, and fragmentation patterns) and need to export it for use in either Excalibur-based DDA experiments on an Orbitrap mass spectrometer, or in Skyline for targeted.
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  75. Dense Neural Network Layer Construction · holobiomicslab
    Use when when you have a binned MS/MS spectrum vector (e.g., 9948-dimensional input from 10,000 equally-spaced m/z bins in the 10–1000 Da range) and need to compress it into a learned latent representation (e.
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  76. Distance Matrix Generation From Indexes · holobiomicslab
    Use when you have pre-computed feature-hashed spectrum vectors and nearest neighbor indexes constructed from those vectors, and you need a pairwise distance matrix as input to density-based clustering (e.g., DBSCAN).
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  77. Duplicate Feature Detection And Removal · holobiomicslab
    Use when you have peak-picked LC-MS data with multiple features that may represent the same metabolite detected at slightly different m/z or retention time values due to instrument precision limits, isotope variants, or adduct forms.
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  78. Entropy Search Algorithm Implementation · holobiomicslab
    Use when you need to search one or more query MS/MS spectra against large spectral libraries (hundreds of thousands to millions of spectra) and require real-time or near-real-time compound identification.
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  79. False Positive Mitigation In Annotation · holobiomicslab
    Use when you have implemented an automated feature annotation or adduct detection module and need to verify that assigned labels (e.g., [M+NH4]+, [M+K]+, [M+H2O+H]+, [M-H2O+H]+) are accurate and do not produce erroneous assignments on a reference feature set.
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  80. Fatty Acyl Chain Variant Identification · holobiomicslab
    Use when when a metabolite feature has been assigned a top-rank lipid annotation (e.g., LPC(14:0)) but you need to assess whether related lipid species containing the same fatty acyl chain(s) (e.g., PC fragments with 14:0 acyl chains) also match the observed spectrum with lower scores.
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  81. Feature Missingness Threshold Filtering · holobiomicslab
    Use when after loading and formatting raw peak-picked LC-MS metabolomics data frames (via metabData constructor) when you need to eliminate features with poor sample coverage before feature alignment.
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  82. Feature Similarity Network Construction · holobiomicslab
    Use when you have a filtered MS-DIAL peak list (post-generic filtering, containing m/z, retention time, and peak intensity metrics) and need to identify groups of co-eluting or structurally similar features before extracting parental signals or annotating metabolites.
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  83. Feature Table Alignment And Integration · holobiomicslab
    Use when you have aligned feature tables (CSV format) paired with MS2 spectral data (MGF or mzML files) and need to compare chemodiverse samples with poor feature overlap or strong retention-time shifts across different LC methods or mass spectrometer technologies (e.g., Orbitrap vs. Q-ToF).
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  84. Feature Table Blank Intensity Detection · holobiomicslab
    Use when after loading an MZmine3-exported feature quantification table from non-targeted LC-MS/MS data when your experiment includes blank (negative control) samples and you need to remove features attributable to contamination or instrument background before downstream statistical analysis.
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  85. Feature Wise Spectrum Count Aggregation · holobiomicslab
    Use when when you have extracted concatenated MS/MS spectra for multiple features from replicate mzML files and need to verify that a TIC-based filtering step (e.g., top x% TIC extraction) reduces per-feature spectrum counts to expected target levels.
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  86. Filter Outcome Aggregation And Counting · holobiomicslab
    Use when after applying one or more mpactr filters (mispicked, group, cv, insource) to a feature table, you need to quantify the distribution of ions by their pass/fail status across filters to understand filtering impact, identify potential over-filtering, or communicate QC results via treemap or.
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  87. Formula Annotation Capping By Frequency · holobiomicslab
    Use when when preparing multi-formula MS/MS training data for a rescore model, if the raw positive examples show extreme imbalance (some formulas represented by hundreds of spectra while others have only a few).
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  88. Formula Assignment In Mass Spectrometry · holobiomicslab
    Use when you have m/z values from mass spectrometry imaging (or similar MSI experiments) and need to assign molecular formulae to them. This is especially valuable when working with spatially-resolved metabolomics data where annotation precision lags behind traditional LC-MS approaches.
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  89. Fragmentation Pattern Spectral Matching · holobiomicslab
    Use when when you have detected m/z values from LC-IM-MS/MS that match a candidate CCS prediction database but require structural confirmation. Apply this skill to disambiguate isomers (e.
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  90. Gnps Data Format Conversion And Mapping · holobiomicslab
    Use when you have GNPS molecular networking output (from GNPS1 at https://gnps.ucsd.edu or GNPS2 at https://gnps2.org) that must be integrated with antiSMASH BGC data and MIBiG metadata for natural product mining.
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  91. Graphical Time Warping Parameter Tuning · holobiomicslab
    Use when your XCMS-processed LC-MS dataset exhibits retention-time drift or misalignment artifacts—particularly when analyzing hundreds of samples, data acquisition spans longer than one week, or you observe feature groups with inconsistent m/z or RT that XCMS grouped under a single global warping.
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  92. Instrument Agnostic Feature Engineering · holobiomicslab
    Use when you have DIA raw mass spectrometry files from multiple instrument types (timsTOF, TripleTOF, Orbitrap) and need to build a single machine learning model to predict data quality across all platforms, or when you need to compare quality characteristics of files produced by different.
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  93. Interactive Plot Construction Mass Spec · holobiomicslab
    Use when after LC-MS data has been converted to mzML format and processed through peak detection (e.g., MS-DIAL output) to yield a feature table with internal standard identifications, retention times, m/z values, and intensity measurements across multiple samples.
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  94. Ion Current Calculation And Aggregation · holobiomicslab
    Use when when raw LC-MS feature tables exhibit inter-sample intensity variation due to instrument sensitivity drift, sample ionization efficiency differences, or loading differences, and you need to normalize intensities to a common reference scale before downstream statistical analysis.
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  95. Isotopologue Adduct Link Identification · holobiomicslab
    Use when you have selected statistically significant features from multi-assay untargeted LC-MS metabolomics data and need to group them by structural relationships defined by their mass-to-charge ratios (m/z) and retention times (RT).
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  96. JSON Serialization Of Metabolomics Data · holobiomicslab
    Use when after pre-annotation grouping (e.g., via khipu) has assigned features to empirical compounds, or when exporting feature tables and metadata from asari for downstream analysis in MetaboAnalyst or custom R/Python workflows.
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  97. K Fold Cross Validation Model Selection · holobiomicslab
    Use when when fitting a multi-block PLS discriminant model on multi-assay LC-MS metabolomics data and you need to determine the number of latent variables to retain without overfitting.
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  98. Knowledge Data Driven Layer Integration · holobiomicslab
    Use when you have untargeted metabolomics data (MS/MS spectra) and need to annotate metabolites at scale.
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  99. Lipid Derivatization Chemistry Modeling · holobiomicslab
    Use when you have N-methyl-derivatized unsaturated sterol lipid structures (as SMILES or molecular formula) and need to predict their MS/MS fragmentation behavior before experimental acquisition, or to build a reference spectral library for isomer-level sterol identification in tissue samples.
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  100. Lipid Fragmentation Pattern Application · holobiomicslab
    Use when you have an enumerated list of lipid species (identified by class, fatty acid composition, and chain length) and need to generate theoretical precursor m/z values, fragment ion masses, and relative intensities for targeted or untargeted lipidomics experiments.
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