tf.nest package when we dev theese code , flatten and map_structure pack_sequence_as are need eagerly

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System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow):
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04 x86_64):
• TensorFlow installed from (source or binary):
• TensorFlow version (use command below):
• Java version (i.e., the output of java -version):
• Java command line flags (e.g., GC parameters):
• Python version (if transferring a model trained in Python):
• Bazel version (if compiling from source):
• GCC/Compiler version (if compiling from source):
• CUDA/cuDNN version:
• GPU model and memory:

Describe the current behavior

Describe the expected behavior

Code to reproduce the issue
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Beginne damit, das tf.nest-Paket sowie dessen Implementierungen von flatten, map_structure und pack_sequence_as zu lokalisieren. Der Issue enthält keine Reproduktion, kein erwartetes Verhalten, keine Dateipfade und keine Tests. Bestimme daher zunächst, was „eagerly“ für diese APIs bedeutet, und identifiziere die vorhandene Abdeckung, bevor du eine Abschlussprüfung definierst.