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Bump Flax version for latest JAX compatibility#3476

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copybara-service[bot] merged 1 commit intomainfrom
bvandermoon-bump-flax
Mar 23, 2026
Merged

Bump Flax version for latest JAX compatibility#3476
copybara-service[bot] merged 1 commit intomainfrom
bvandermoon-bump-flax

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@bvandermoon
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@bvandermoon bvandermoon commented Mar 20, 2026

Description

Bump Flax version to support latest JAX nightly. I was seeing this error for a nightly benchmark runner workload which is tied to JAX/Flax incompatibility: TypeError: ShapedArray.__init__() got an unexpected keyword argument 'vma'

Note that we need to generate a clean seed-env run soon. Not doing that here since all MaxText APIs are not currently compatible with the latest JAX version

Tests

build_maxtext_docker_image MODE=stable
python3 -m benchmarks.benchmark_runner xpk \
    --project=tpu-prod-env-one-vm \
    --zone=southamerica-west1 \
    --device_type=v6e-256 \
    --num_slices=1  \
    --cluster_name=$CLUSTER_NAME \
    --base_output_directory=$BASE_OUTPUT_DIRECTORY \
    --model_name="llama3_1_70b_8192" \
    --base_docker_image=maxtext_base_image
build_maxtext_docker_image MODE=nightly
python3 -m benchmarks.benchmark_runner xpk \
    --project=tpu-prod-env-one-vm \
    --zone=southamerica-west1 \
    --device_type=v6e-256 \
    --num_slices=1  \
    --cluster_name=$CLUSTER_NAME \
    --base_output_directory=$BASE_OUTPUT_DIRECTORY \
    --model_name="llama3_1_70b_8192" \
    --base_docker_image=maxtext_base_image

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  • I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
  • I have necessary comments in my code, particularly in hard-to-understand areas.
  • I have run end-to-end tests tests and provided workload links above if applicable.
  • I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

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codecov Bot commented Mar 20, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

@bvandermoon bvandermoon force-pushed the bvandermoon-bump-flax branch from 1dbf5aa to 3841c87 Compare March 21, 2026 00:10
@copybara-service copybara-service Bot merged commit e00165c into main Mar 23, 2026
46 checks passed
@copybara-service copybara-service Bot deleted the bvandermoon-bump-flax branch March 23, 2026 18:23
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3 participants