Major update: Keras 3

[takumiohym]

This is a PR to manage the major update to Keras 3.

Phase 1:

• introduction_to_tensorflow @takumiohym
  • 3_keras_sequential_api_vertex.ipynb Keras 3 Update - Sequential API #629
  • 4_keras_functional_api.ipynb Keras 3 update - Functional API #624
• feature_engineering @takumiohym Remove feature_engineering directory #628
  • 4_keras_adv_feat_eng.ipynb Move and update the advanced feature engineering notebook #644
• building_production_ml_systems @takumiohym
  • 1_training_at_scale_vertex.ipynb Update custom training notebook #647
  • 2_hyperparameter_tuning_vertex.ipynb Update hptune notebook to Keras 3 and Python SDK #648
  • Remove other notebooks delete unused notebooks from building_production_ml_systems #646
• time_series_prediction @kylesteckler
• image_models (only core notebooks) @takumiohym
  • 1_mnist_linear.ipynb Update 1_mnist_linear to Keras 3 #649
  • 2_mnist_models_vertex.ipynb Replace 2_mnist_models_vertex with 2_mnist_cnn #651
  • 3_tf_hub_transfer_learning.ipynb Update the transfer learning notebook to Keras 3 #658
  • Remove 4_tpu_training.ipynb and 5_fashion_mnist_class.ipynb Remove unused notebooks under image_models #652
  • diffusion_model.ipynb Keras 3 Update - Diffusion Models #632
  • serving.ipynb Update image serving notebook to Keras 3 #659
  • autoencoder_anomaly_detection.ipynb Keras 3 update - autoencoder #630
  • variational_autoencoder.ipynb Keras 3 update - VAE #631
• text_models (only core notebooks) @sanjanalreddy
  • remove automl_for_text_classification.ipynb remove automl for text classification #656
  • keras_for_text_classification.ipynb updating keras_for_text_classification.ipynb to keras3 #654
  • reusable_embeddings.ipynb update reusable_embeddings_vertex.ipynb  #666
  • rnn_encoder_decoder.ipynb
  • classify_text_with_bert.ipynb update classify_text_with_bert.ipynb to Keras3 #660

Phase 2:

• introduction_to_tensorflow (remaining notebooks) @takumiohym
  • 1_introduction_to_jax.ipynb Add intro to JAX #683
  • 2_dataset_api.ipynb Updated tf.data notebook (copy of #662) #706
  • Rename the directory to introduction_to_neural_network
• end-to-end-structured @sanjanalreddy
• kubeflow_pipelines/walkthrough (Update to Python SDK) @takumiohym
  • kfp_walkthrough_vertex.ipynb update KFP walkthrough notebook to use Python SDK #702
  • kfp_walkthrough_vertex_pytorch.ipynb Update Pytorch walkthrough notebook to use Vertex AI Python SDK #739
• image_models (remaining notebooks) @takumiohym
  • conditional_gan.ipynb Update conditional_gan notebooks to Keras3 #686
  • create_tfrecords_at_scale.ipynb Fix and update create_tfrecords #685
  • deepconv_gan.ipynb Update deepconv_gan #684
  • object_detection_od_api.ipynb - Will keep this since this runs as it is in a dedicated kernel, but should be replaced with Keras Hub version when YOLOv8 migration from keras_cv -> keras_hub is completed. Code is already ready in KerasCV object detection solution notebook #532. Reference: YOLOV8 port to keras-hub keras-team/keras-hub#1899.
  • stable_diffusion_dreambooth.ipynb Add Keras CV kernel for the stable diffusion fine-tuning notebook #738
  • tfrecords_tfdata.ipynb - No update required
  • unet_segmentation_vertex.ipynb update u-net notebooks to Keras 3 #687
  • vertex_tuning_image_classification.ipynb Remove image hptuning notebook #688
• text_models (remaining notebooks) @sanjanalreddy
  • text_generation_using_transformer.ipynb Update text_generation_using_transformer to Keras Hub #729
• tfx_pipelines Remove TFX module #749
• uncertainty_aware_models remove uncertainty_aware_models #746 @takumiohym
• multi_modal @takumiohym Update image captioning notebook to Keras 3 #736
• responsible_ai @takumiohym
  • xai_image_saliency.ipynb Update saliency lib notebook to Keras3 #667
  • xai_image_vertex.ipynb Add TF_USE_LEGACY_KERAS env variable to Vertex XAI notebook #689
  • xai_text_with_lit.ipynb Update LIT notebook to Keras3 #665
  • min_diff_keras.ipynb Update Mindiff notebook #680
  • privacy_dpsgd.ipynb Update dpsgd notebook to use a dedicated kernel #682
  • gemini_safety_ratings.ipynb Update gemini version in safety notebook #681
• recommendation_systems @kylesteckler
• reinforcement_learning @takumiohym
  • ppo_with_keras.ipynb Reinforcement Learning with PPO notebook #744
  • remove contextual_bandits_with_tf_agents.ipynb Remove contextual bandits notebook #745
• vertex_genai (Remove ADK kernel) @takumiohym Remove adk kernel & updated ADK version #698

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