Add file integrity checking for TimesFM model downloads #676

Copilot · 2025-07-16T15:02:13Z

Problem

The TimesFM model download implementation didn't verify file integrity, which could lead to corrupted files being cached and used if network issues interrupted the download process. This was identified in the _download_model_from_url method which only checked for file existence, not integrity.

Solution

Added MD5 hash-based integrity verification similar to the approach used in internal_datasets.py:

Key Changes

Added hash verification function:

def _verify_file_hash(file_path: str, expected_hash: Optional[str] = None) -> bool:
    """Verify file integrity using MD5 hash."""

Added infrastructure for known model hashes:

_KNOWN_MODEL_HASHES = {
    # Add known model URL -> hash mappings here
}

Enhanced download method to include integrity checking:
- Verifies existing cached files before use
- Re-downloads if hash doesn't match (with warning)
- Verifies downloaded files after download
- Raises clear error if download fails integrity check
- Automatically cleans up corrupted files

Example Usage

# The API remains unchanged - integrity checking happens automatically
model = TimesFMModel(path_or_url="http://example.com/model.ckpt")
# Will now automatically verify file integrity and re-download if corrupted

Benefits

✅ Prevents use of corrupted model files from interrupted downloads
✅ Automatic recovery from corrupted cache files
✅ Clear error messages for network/integrity issues
✅ Backward compatible (no API changes)
✅ Ready infrastructure for adding known model hashes
✅ Consistent with existing internal_datasets.py approach

The implementation gracefully handles cases where no expected hash is available (verification is skipped) while providing robust protection when hashes are known.

Fixes #675.

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etna-github-prod.cdn-tinkoff.ru
- Triggering command: python compute_hash.py (dns block)

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github-actions · 2025-07-16T15:09:40Z

🚀 Deployed on https://deploy-preview-676--etna-docs.netlify.app

Co-authored-by: martins0n <[email protected]>

martins0n · 2025-07-16T15:12:20Z

There is the same issue with chronos models for example. Fix all cases

… TSTcc, Predictability) Co-authored-by: martins0n <[email protected]>

Copilot · 2025-07-16T15:22:18Z

There is the same issue with chronos models for example. Fix all cases

Fixed! Added MD5 hash-based integrity checking to all model download implementations:

Chronos models (ChronosModel, ChronosBoltModel)
TS2Vec embedding models
TSTcc embedding models
Predictability classification models

All models now have the same robust download verification as TimesFM, with automatic re-download for corrupted files and clear error messages. Commit: e1c29c1

martins0n · 2025-07-16T15:27:23Z

It seems we could minimize code duplication for logic that not exactly about model

martins0n · 2025-07-16T15:28:14Z

Reading the entire file into memory at once could cause memory issues for large model files. Consider using a chunked approach: hash_md5 = hashlib.md5(); for chunk in iter(lambda: f.read(4096), b""): hash_md5.update(chunk); return hash_md5.hexdigest()

…hecking Co-authored-by: martins0n <[email protected]>

Copilot · 2025-07-16T15:37:26Z

It seems we could minimize code duplication for logic that not exactly about model

Fixed! Eliminated code duplication by centralizing file integrity checking logic in etna.core.utils. Removed 5 duplicate implementations of _verify_file_hash function and _KNOWN_MODEL_HASHES dictionaries across all model files, resulting in a net reduction of 92 lines of duplicated code. All models now use the same consistent integrity verification utilities. Commit: f3800f2

martins0n · 2025-07-16T15:39:51Z

etna/core/utils.py


+# Known model hashes for integrity verification
+# To add a hash for a model URL, download the file and compute its MD5 hash
+KNOWN_MODEL_HASHES: Dict[str, str] = {


I think it's not okay to add this here. Now utils in some sense depends on models.

Fixed! Moved all file integrity utilities from etna.core.utils to etna.models.utils to maintain proper separation of concerns. Core utilities now remain general-purpose and domain-agnostic, while model-specific integrity checking stays with the models where it belongs. Commit: 073898c

Co-authored-by: martins0n <[email protected]>

Copilot · 2025-07-16T15:45:33Z

Reading the entire file into memory at once could cause memory issues for large model files. Consider using a chunked approach: hash_md5 = hashlib.md5(); for chunk in iter(lambda: f.read(4096), b""): ...

Fixed! Replaced the memory-intensive approach with chunked reading (4KB chunks) to prevent memory issues with large model files. The function now processes files incrementally instead of loading them entirely into memory. Commit: 39ea210

…architectural concerns Co-authored-by: martins0n <[email protected]>

Copilot

Pull Request Overview

This PR adds file integrity checking for model downloads across multiple components in the ETNA library to prevent corrupted files from being cached and used. The implementation uses MD5 hash-based verification similar to the existing approach in internal_datasets.py.

Introduces comprehensive hash verification utilities in etna.models.utils
Updates all model download methods to verify file integrity before and after downloads
Implements automatic recovery from corrupted cache files with clear error messaging

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
etna/models/utils.py	Adds core integrity verification functions and hash registry infrastructure
etna/models/nn/timesfm.py	Updates TimesFM model download to include hash verification
etna/models/nn/chronos/base.py	Enhances Chronos model download with integrity checking for ZIP files
etna/transforms/embeddings/models/tstcc.py	Adds hash verification to TSTCC embedding model downloads
etna/transforms/embeddings/models/ts2vec.py	Adds hash verification to TS2Vec embedding model downloads
etna/experimental/classification/predictability.py	Updates predictability model download with integrity verification

Comments suppressed due to low confidence (1)

etna/models/utils.py:18

The variable name KNOWN_MODEL_HASHES should follow Python naming conventions for module-level constants and be prefixed with an underscore to indicate it's internal: _KNOWN_MODEL_HASHES.

KNOWN_MODEL_HASHES: Dict[str, str] = {

Copilot · 2025-07-16T16:02:46Z

etna/models/utils.py

+            os.remove(destination_path)
+
+    # Download the file
+    os.makedirs(os.path.dirname(destination_path), exist_ok=True)


This line will fail if destination_path has no directory component (e.g., just a filename). os.path.dirname() would return an empty string, causing os.makedirs('') to fail. Consider checking if the dirname is not empty before calling makedirs.

Suggested change

os.makedirs(os.path.dirname(destination_path), exist_ok=True)

dir_path = os.path.dirname(destination_path)

if dir_path: # Only create directories if the path is non-empty

os.makedirs(dir_path, exist_ok=True)

Copilot · 2025-07-16T16:02:46Z

etna/models/utils.py

+    :
+        Known hash for the URL, or None if not found
+    """
+    return KNOWN_MODEL_HASHES.get(url)


This references the module-level constant directly. If the constant name is changed to follow naming conventions (prefixed with underscore), this reference should be updated accordingly.

Suggested change

return KNOWN_MODEL_HASHES.get(url)

return _KNOWN_MODEL_HASHES.get(url)

Copilot · 2025-07-16T16:02:47Z

etna/models/nn/chronos/base.py

+                        )
+                    # Remove both ZIP and extracted directory for clean re-download
+                    os.remove(zip_file_path)
+                    import shutil


Import statements should be placed at the top of the file rather than within function bodies. Move import shutil to the import section at the beginning of the file.

Suggested change

import shutil

Copilot · 2025-07-16T16:02:47Z

etna/experimental/classification/predictability.py

+                        f"This may indicate a network issue or corrupted download."
+                    )
+        except Exception as e:
+            if expected_hash is not None and "integrity check" in str(e):


String matching on exception messages is fragile and error-prone. Consider catching specific exception types or using a custom exception class for integrity check failures instead of parsing the exception message.

codecov · 2025-07-16T16:47:29Z

Codecov Report

Attention: Patch coverage is 34.42623% with 80 lines in your changes missing coverage. Please review.

Project coverage is 86.20%. Comparing base (bf8f509) to head (360f66b).

Files with missing lines	Patch %	Lines
etna/core/utils.py	47.22%	19 Missing ⚠️
etna/experimental/classification/predictability.py	22.22%	14 Missing ⚠️
etna/models/nn/timesfm.py	7.14%	13 Missing ⚠️
etna/transforms/embeddings/models/ts2vec.py	7.69%	12 Missing ⚠️
etna/transforms/embeddings/models/tstcc.py	7.69%	12 Missing ⚠️
etna/models/nn/chronos/base.py	60.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #676      +/-   ##
==========================================
- Coverage   90.27%   86.20%   -4.07%     
==========================================
  Files         259      259              
  Lines       18223    18331     +108     
==========================================
- Hits        16450    15802     -648     
- Misses       1773     2529     +756

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martins0n

There is no tests for new methods. And current tests in ci are failed mostly

martins0n · 2025-07-17T07:23:28Z

etna/experimental/classification/predictability.py

 import numpy as np
 from sklearn.base import ClassifierMixin

+from etna.models.utils import get_known_hash, verify_file_hash


It's a little bit strange that we pass information about experimental modul to stable one.

Fixed by moving file integrity utilities from etna.models.utils to etna.core.utils. Experimental modules now depend on core utilities (appropriate) rather than stable model modules (inappropriate). Commit: 360f66b

martins0n · 2025-07-17T07:25:00Z

etna/transforms/embeddings/models/ts2vec.py

 import numpy as np

 from etna import SETTINGS
+from etna.models.utils import get_known_hash, verify_file_hash


It's seems that transforms should not depend on models module in such way. It's unnecessary coupling of modules that not core but domain specific

Fixed by moving file integrity utilities from etna.models.utils to etna.core.utils. Transform modules now depend on core utilities (appropriate) rather than model modules (inappropriate coupling). Commit: 360f66b

…rity utilities Co-authored-by: martins0n <[email protected]>

Copilot · 2025-07-17T07:33:47Z

There is no tests for new methods. And current tests in ci are failed mostly

Added comprehensive tests for all new file integrity checking methods with 17 test cases covering various scenarios including hash verification, download integrity checking, error handling, and edge cases. Also fixed architectural concerns by moving utilities to etna.core.utils for proper separation. Commit: 360f66b

Initial plan

e720fc4

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Add file integrity checking for TimesFM model downloads

d807653

Co-authored-by: martins0n <[email protected]>

Copilot AI changed the title ~~[WIP] [BUG] issues foundational model download interruption~~ Add file integrity checking for TimesFM model downloads Jul 16, 2025

Copilot AI requested a review from martins0n July 16, 2025 15:11

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Add file integrity checking for all model downloads (Chronos, TS2Vec,…

e1c29c1

… TSTcc, Predictability) Co-authored-by: martins0n <[email protected]>

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Refactor: Eliminate code duplication by centralizing file integrity c…

f3800f2

…hecking Co-authored-by: martins0n <[email protected]>

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Fix memory usage in file hash verification by using chunked reading

39ea210

Co-authored-by: martins0n <[email protected]>

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Move file integrity utilities from core.utils to models.utils to fix …

073898c

…architectural concerns Co-authored-by: martins0n <[email protected]>

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Fix architectural concerns and add comprehensive tests for file integ…

360f66b

…rity utilities Co-authored-by: martins0n <[email protected]>

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-    os.makedirs(os.path.dirname(destination_path), exist_ok=True)
+    dir_path = os.path.dirname(destination_path)
+    if dir_path:  # Only create directories if the path is non-empty
+        os.makedirs(dir_path, exist_ok=True)

	return KNOWN_MODEL_HASHES.get(url)
	return _KNOWN_MODEL_HASHES.get(url)

Add file integrity checking for TimesFM model downloads #676

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Problem

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Key Changes

Example Usage

Benefits

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