chore(deps): bump tensorflow from 1.15.4 to 2.4.0 in /components/kubeflow/dnntrainer/src

[dependabot]

Bumps tensorflow from 1.15.4 to 2.4.0.

Release notes

Sourced from tensorflow's releases.

TensorFlow 2.4.0

Release 2.4.0

Major Features and Improvements

• tf.distribute introduces experimental support for asynchronous training of models via the tf.distribute.experimental.ParameterServerStrategy API. Please see the tutorial to learn more.

• MultiWorkerMirroredStrategy is now a stable API and is no longer considered experimental. Some of the major improvements involve handling peer failure and many bug fixes. Please check out the detailed tutorial on Multi-worker training with Keras.

• Introduces experimental support for a new module named tf.experimental.numpy which is a NumPy-compatible API for writing TF programs. See the detailed guide to learn more. Additional details below.

• Adds Support for TensorFloat-32 on Ampere based GPUs. TensorFloat-32, or TF32 for short, is a math mode for NVIDIA Ampere based GPUs and is enabled by default.

• A major refactoring of the internals of the Keras Functional API has been completed, that should improve the reliability, stability, and performance of constructing Functional models.

• Keras mixed precision API tf.keras.mixed_precision is no longer experimental and allows the use of 16-bit floating point formats during training, improving performance by up to 3x on GPUs and 60% on TPUs. Please see below for additional details.

• TensorFlow Profiler now supports profiling MultiWorkerMirroredStrategy and tracing multiple workers using the sampling mode API.

• TFLite Profiler for Android is available. See the detailed guide to learn more.

• TensorFlow pip packages are now built with CUDA11 and cuDNN 8.0.2.

Breaking Changes

• TF Core:

  • Certain float32 ops run in lower precsion on Ampere based GPUs, including matmuls and convolutions, due to the use of TensorFloat-32. Specifically, inputs to such ops are rounded from 23 bits of precision to 10 bits of precision. This is unlikely to cause issues in practice for deep learning models. In some cases, TensorFloat-32 is also used for complex64 ops. TensorFloat-32 can be disabled by running tf.config.experimental.enable_tensor_float_32_execution(False).
  • The byte layout for string tensors across the C-API has been updated to match TF Core/C++; i.e., a contiguous array of tensorflow::tstring/TF_TStrings.
  • C-API functions TF_StringDecode, TF_StringEncode, and TF_StringEncodedSize are no longer relevant and have been removed; see core/platform/ctstring.h for string access/modification in C.
  • tensorflow.python, tensorflow.core and tensorflow.compiler modules are now hidden. These modules are not part of TensorFlow public API.
  • tf.raw_ops.Max and tf.raw_ops.Min no longer accept inputs of type tf.complex64 or tf.complex128, because the behavior of these ops is not well defined for complex types.
  • XLA:CPU and XLA:GPU devices are no longer registered by default. Use TF_XLA_FLAGS=--tf_xla_enable_xla_devices if you really need them, but this flag will eventually be removed in subsequent releases.

• tf.keras:

  • The steps_per_execution argument in model.compile() is no longer experimental; if you were passing experimental_steps_per_execution, rename it to steps_per_execution in your code. This argument controls the number of batches to run during each tf.function call when calling model.fit(). Running multiple batches inside a single tf.function call can greatly improve performance on TPUs or small models with a large Python overhead.
  • A major refactoring of the internals of the Keras Functional API may affect code that is relying on certain internal details:
    • Code that uses isinstance(x, tf.Tensor) instead of tf.is_tensor when checking Keras symbolic inputs/outputs should switch to using tf.is_tensor.
    • Code that is overly dependent on the exact names attached to symbolic tensors (e.g. assumes there will be ":0" at the end of the inputs, treats names as unique identifiers instead of using tensor.ref(), etc.) may break.
    • Code that uses full path for get_concrete_function to trace Keras symbolic inputs directly should switch to building matching tf.TensorSpecs directly and tracing the TensorSpec objects.
    • Code that relies on the exact number and names of the op layers that TensorFlow operations were converted into may have changed.
    • Code that uses tf.map_fn/tf.cond/tf.while_loop/control flow as op layers and happens to work before TF 2.4. These will explicitly be unsupported now. Converting these ops to Functional API op layers was unreliable before TF 2.4, and prone to erroring incomprehensibly or being silently buggy.
    • Code that directly asserts on a Keras symbolic value in cases where ops like tf.rank used to return a static or symbolic value depending on if the input had a fully static shape or not. Now these ops always return symbolic values.
    • Code already susceptible to leaking tensors outside of graphs becomes slightly more likely to do so now.
    • Code that tries directly getting gradients with respect to symbolic Keras inputs/outputs. Use GradientTape on the actual Tensors passed to the already-constructed model instead.
    • Code that requires very tricky shape manipulation via converted op layers in order to work, where the Keras symbolic shape inference proves insufficient.
    • Code that tries manually walking a tf.keras.Model layer by layer and assumes layers only ever have one positional argument. This assumption doesn't hold true before TF 2.4 either, but is more likely to cause issues now.

... (truncated)

Changelog

Sourced from tensorflow's changelog.

Release 2.4.0

Major Features and Improvements

• tf.distribute introduces experimental support for asynchronous training of models via the [tf.distribute.experimental.ParameterServerStrategy] (https://www.tensorflow.org/api_docs/python/tf/distribute/experimental/ParameterServerStrategy) API. Please see the tutorial to learn more.

• MultiWorkerMirroredStrategy is now a stable API and is no longer considered experimental. Some of the major improvements involve handling peer failure and many bug fixes. Please check out the detailed tutorial on [Multi-worker training with Keras] (https://www.tensorflow.org/tutorials/distribute/multi_worker_with_keras).

• Introduces experimental support for a new module named [tf.experimental.numpy] (https://www.tensorflow.org/api_docs/python/tf/experimental/numpy) which is a NumPy-compatible API for writing TF programs. See the [detailed guide] (https://www.tensorflow.org/guide/tf_numpy) to learn more. Additional details below.

• Adds Support for TensorFloat-32 on Ampere based GPUs. TensorFloat-32, or TF32 for short, is a math mode for NVIDIA Ampere based GPUs and is enabled by default.

• A major refactoring of the internals of the Keras Functional API has been completed, that should improve the reliability, stability, and performance of constructing Functional models.

• Keras mixed precision API [tf.keras.mixed_precision] (https://www.tensorflow.org/api_docs/python/tf/keras/mixed_precision?version=nightly) is no longer experimental and allows the use of 16-bit floating point formats during training, improving performance by up to 3x on GPUs and 60% on TPUs. Please see below for additional details.

• TensorFlow Profiler now supports profiling MultiWorkerMirroredStrategy and tracing multiple workers using the [sampling mode API] (https://www.tensorflow.org/guide/profiler#profiling_apis).

• TFLite Profiler for Android is available. See the detailed [guide] (https://www.tensorflow.org/lite/performance/measurement#trace_tensorflow_lite_internals_in_android) to learn more.

• TensorFlow pip packages are now built with CUDA11 and cuDNN 8.0.2.

Breaking Changes

• TF Core:
  • Certain float32 ops run in lower precision on Ampere based GPUs, including

... (truncated)

Commits

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[capri-xiyue]

/ok-to-test

[dependabot]

Superseded by #6030.