.PB File Format – Op registry

Where the entries come from

• Op names, inputs, outputs, attribute types, defaults, allowed values, minimums and deprecations are those of tensorflow/core/ops/ops.pbtxt, the registry as one text file, and of tensorflow/compiler/tf2xla/ops/xla_ops.cc for the XLA ops.
• Most summaries, and the meanings of most attributes that have a default, follow TensorFlow’s own documentation of each op as published in its Go bindings (tensorflow/go/op/wrappers.go).
• The Go bindings leave out about 390 ops: the TensorFlow 1 forms that take reference-typed variables (Assign, ApplyAdam, ScatterAdd), ops that take functions (If, While, PartitionedCall, many tf.data datasets) and internal ops. Their summaries were written for this site from their definitions and the documented ops they are forms of. A few common ops, such as Const, have a summary written for this site.
• An attribute that only names the type of some inputs or outputs (T, Tidx), counts them (N) or lists their types (Tin, output_types) is explained from the signature: the entry says which inputs and outputs it governs.
• The other attributes the Go bindings do not document were given meanings for this site from TensorFlow’s op documentation; where many ops share a name in the same sense (container, shared_name, use_locking, metadata on tf.data datasets), they share the meaning. Every attribute of every op has a meaning.
• An op that was deprecated gives the GraphDef version (the graph’s producer version) from which TensorFlow refuses it.

A node may also name an op this list does not hold:

• a function in the graph’s library, which the viewer shows as a call;
• an internal op whose name starts with an underscore, such as _Arg, _Retval or the Grappler fusions _FusedConv2D and _FusedMatMul, which ops.pbtxt leaves out; the viewer names the common ones;
• an op registered elsewhere in TensorFlow, such as the XLA JIT’s XlaLaunch or TF-TRT’s TRTEngineOp, which the viewer names without listing their attributes;
• a custom op, or one newer than this list. The MetaGraphDef’s stripped_op_list holds the definition of every op its graphs use.

Ops

The table is built in the browser from the same tables the viewer uses, so it needs scripts; without them this page shows only the text above. Each op has an anchor, #op- followed by its name, such as #op-Conv2D.