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Stall ranks with tf.keras.callbacks.TensorBoard

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**Environment:** 1. Framework: TensorFlow 2. Framework version: 2.5.0 3. Horovod version: 0.22.1 4. MPI version: 3.0.0 5. CUDA version: 11.2 6. NCCL version: 2.8.4-1+cuda10.2 7. Python version: 3.6.9 8. Spark...