{"record":{"id":"a8b9067bc6e7342e","repo":"huggingface/candle","slug":"no-data-in-file","errorCode":null,"errorMessage":"No data in file {}","messagePattern":"No data in file (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"candle-core/src/quantized/imatrix_file.rs","lineNumber":37,"sourceCode":"    })?;\n    let mut buffer = Vec::new();\n    file.read_to_end(&mut buffer).map_err(|e| {\n        crate::Error::msg(format!(\n            \"Failed to read file {}: {}\",\n            fname.as_ref().display(),\n            e\n        ))\n    })?;\n\n    let mut cursor = Cursor::new(buffer);\n\n    let n_entries = cursor\n        .read_i32::<LittleEndian>()\n        .map_err(|e| crate::Error::msg(format!(\"Failed to read number of entries: {e}\")))?\n        as usize;\n\n    if n_entries < 1 {\n        crate::bail!(\"No data in file {}\", fname.as_ref().display());\n    }\n\n    for i in 0..n_entries {\n        // Read length of the name\n        let len = cursor.read_i32::<LittleEndian>().map_err(|e| {\n            crate::Error::msg(format!(\n                \"Failed to read name length for entry {}: {}\",\n                i + 1,\n                e\n            ))\n        })? as usize;\n\n        // Read the name\n        let mut name_buf = vec![0u8; len];\n        cursor.read_exact(&mut name_buf).map_err(|e| {\n            crate::Error::msg(format!(\"Failed to read name for entry {}: {}\", i + 1, e))\n        })?;\n        let name = String::from_utf8(name_buf).map_err(|e| {","sourceCodeStart":19,"sourceCodeEnd":55,"githubUrl":"https://github.com/huggingface/candle/blob/d5fee525bfde3273eb7c9b75fd2bc4937be867ca/candle-core/src/quantized/imatrix_file.rs#L19-L55","documentation":"Raised by `read_imatrix` (imatrix_file::read) in candle-core/src/quantized/imatrix_file.rs when the i32 entry count read from the start of an importance-matrix (imatrix) file is less than 1. It means the imatrix file is empty or corrupt and contains no calibration entries.","triggerScenarios":"load_imatrix on a zero-byte or truncated file whose first i32 reads as 0 or negative (e.g. all-zero bytes from a failed download).","commonSituations":"Pointing at an empty placeholder file; interrupted imatrix generation producing an empty output; wrong path passed for the imatrix argument.","solutions":["Regenerate the imatrix file with the quantization toolchain and confirm it is non-empty","Check file size > 4 bytes before loading and verify the path is correct","Re-download the imatrix file if it came from a remote source"],"exampleFix":"// before\nlet imatrix = load_imatrix(\"imatrix.gguf\")?; // empty file\n// after\nlet meta = std::fs::metadata(\"imatrix.gguf\")?;\nassert!(meta.len() > 4, \"imatrix file is empty or truncated\");\nlet imatrix = load_imatrix(\"imatrix.gguf\")?;","handlingStrategy":"validation","validationCode":"let meta = std::fs::metadata(\"imatrix.dat\")?;\nif meta.len() <= 4 {\n    return Err(anyhow!(\"imatrix file is empty or truncated ({} bytes)\", meta.len()));\n}","typeGuard":null,"tryCatchPattern":"match load_imatrix(&fname) {\n    Ok(m) => m,\n    Err(e) if e.to_string().contains(\"No data in file\") => {\n        eprintln!(\"imatrix file has zero entries; regenerate it\");\n        return Err(e.into());\n    }\n    Err(e) => return Err(e.into()),\n}","preventionTips":["Check file size before loading imatrix files","Confirm the imatrix generation job completed successfully","Verify paths point to the imatrix file, not a placeholder"],"tags":["imatrix","empty-file","parsing"],"backgroundTag":"empty-input-file","analyzedSha":"d5fee525bfde3273eb7c9b75fd2bc4937be867ca","analyzedAt":"2026-09-02T00:15:47.023Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T06:17:21.866Z"}