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Overview of TensorFlow Versions

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Different TensorFlow Versions

The TensorFlow library’s versioning is done semantically for all APIs that are available publicly. A release of TensorFlow has the Major, Minor, Patch form.

Current TensorFlow version is 2.0.0

Major: Version 2

Minor: Version 0

Patch Version 0

Changes to each number have the below meaning:

1. Major: This release version denotes all the existing functionalities that are made incompatible in the current release. Still, a few things can be used, such as graphs and checkpoints, which can be migrated.

2. Minor: The release version shows what all of the existing features are not updated and are still the same.

The TensorFlow library’s public APIs are eligible for backward compatibility across all the versions including minor and patch. The different public API consists of:

All the python functions and their classes are included for the backward compatibility. Except for private symbols or functions or classes whose name begins with _(underscore)

As part of the version upgrade the things which are not covered for backward compatibility.

Experimental APIs: all the experimental APIs are not included for backward compatibility as these are purely based on experimental purposes. Particularly the below are not covered for backward compatibility.

Any symbol present in the tf.contrib module, including its submodules.

Any symbol containing experimental as a keyword is also ignored.

Any module whose method or a class contains experimental keyword are also exempted.

Other languages API such as C++, Java, Go, JavaScript all are exempted.

Composite operations are also not included.

Floating-point numbers.

Random numbers.

Skewness in distributed TensorFlow

Bugs

Error Behavior

Now let’s discuss the version compatibility of saved models, graphs and checkpoints. Model saving is an efficient way of building and reusing the ML models in different programs; this is a kind of serialization of objects functionality provided by the TensorFlow community.

Saved models consist of two parts:

Encoded graphs which are also called GraphDefs (there can be 1 or more encode graphs)

CheckPoint

1. Version Compatibility for GraphDefs or Encoded Graphs

Every version release for the TensorFlow supports an interval for the GraphDef versions. This interval is constant across the patch releases. And it’s only modified when there is a major release happens. The support for Graphdef only happens when there is a major release.

Currently, TensorFlow 1.2 is supporting GraphDefs versions from 4 to 7.

TensorFlow 1.3 has added GraphDefs version 8, and it is supporting versions 4 to 8.

But in TensorFlow 2.0.0 support is dropped for versions 4 to 7, and only supporting version 8.

Since the major release has happened, that’s why the support has been dropped.

TensorFlow provides different tools for converting the old graphs to the new version when the support is dropped.

2. Checkpoint Compatibility

The checkpoint compatibility is divided into two as below:

Backward Compatibility

Partial Forward Compatibility

1. Backward Compatibility: This functionality is considered when we need to implement the graphs which are developed and include graphs developed in the older version.

2. Forward Compatibility: Considers a scenario where the developer or we can say the creator of a graph or a checkpoint is upgraded to a newer version of TensorFlow before the consumer uses it. That time this forward compatibility is used.

Conclusion

In this article, we have seen how the versioning happens in TensorFlow and the different packages included as part of the upgrade and which are all the ones excluded. How the old code is made compatible with the new upgraded versions, and how the compatibility works in TensorFlow and what TensorFlow does to implement support for handling the code between different versions.