initial tf progress

src/CMakeLists.txt

@@ -35,6 +35,7 @@ target_include_directories(migraphx SYSTEM PUBLIC $<BUILD_INTERFACE:${HALF_INCLU
 set(PACKAGE_DEPENDS)
 
 add_subdirectory(onnx)
+add_subdirectory(tf)
 add_subdirectory(targets/cpu)
 if(MIGRAPHX_ENABLE_GPU)
 list(APPEND PACKAGE_DEPENDS MIOpen rocblas)

src/include/migraphx/tf.hpp

+#ifndef MIGRAPHX_GUARD_MIGRAPHLIB_TF_HPP
+#define MIGRAPHX_GUARD_MIGRAPHLIB_TF_HPP
+
+#include <migraphx/program.hpp>
+#include <migraphx/config.hpp>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+
+struct unknown
+{
+    std::string op;
+    std::string name() const { return "unknown:" + op; }
+    shape compute_shape(std::vector<shape> input) const
+    {
+        if(input.empty())
+            return {};
+        else
+            return input.front();
+    }
+    friend std::ostream& operator<<(std::ostream& os, const unknown& x)
+    {
+        os << x.name();
+        return os;
+    }
+};
+
+/// Create a program from an onnx file
+program parse_tf(const std::string& name, bool is_nhwc);
+
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/tf/CMakeLists.txt

+find_package(Protobuf REQUIRED)
+
+protobuf_generate_cpp(
+    PROTO_SRCS PROTO_HDRS 
+    graph.proto
+    node_def.proto
+    attr_value.proto
+    tensor.proto
+    tensor_shape.proto
+    resource_handle.proto
+    types.proto
+    function.proto
+    op_def.proto
+    versions.proto
+)
+add_library(tf-proto STATIC ${PROTO_SRCS})
+target_include_directories(tf-proto SYSTEM PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${PROTOBUF_INCLUDE_DIR})
+target_compile_options(tf-proto PRIVATE -w)
+target_link_libraries(tf-proto PRIVATE ${PROTOBUF_LIBRARY})
+set_target_properties(tf-proto PROPERTIES POSITION_INDEPENDENT_CODE On)
+
+add_library(migraphx_tf tf.cpp)
+set_target_properties(migraphx_tf PROPERTIES EXPORT_NAME tf)
+rocm_clang_tidy_check(migraphx_tf)
+target_link_libraries(migraphx_tf PRIVATE tf-proto)
+target_link_libraries(migraphx_tf PUBLIC migraphx)
+
+rocm_install_targets(
+  TARGETS migraphx_tf
+)
+
+add_executable(read_tf read_tf.cpp)
+rocm_clang_tidy_check(read_tf)
+target_link_libraries(read_tf migraphx_tf)
+
+
+# add_executable(verify_onnx verify_onnx.cpp)
+# rocm_clang_tidy_check(verify_onnx)
+# target_link_libraries(verify_onnx migraphx_onnx migraphx_cpu migraphx_gpu)
+
+# add_executable(perf_onnx perf_onnx.cpp)
+# rocm_clang_tidy_check(perf_onnx)
+# target_link_libraries(perf_onnx migraphx_onnx migraphx_cpu migraphx_gpu)
+# endif()

src/tf/attr_value.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "AttrValueProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+import "tensor.proto";
+import "tensor_shape.proto";
+import "types.proto";
+
+// Protocol buffer representing the value for an attr used to configure an Op.
+// Comment indicates the corresponding attr type.  Only the field matching the
+// attr type may be filled.
+message AttrValue {
+  // LINT.IfChange
+  message ListValue {
+    repeated bytes s = 2;                        // "list(string)"
+    repeated int64 i = 3 [packed = true];        // "list(int)"
+    repeated float f = 4 [packed = true];        // "list(float)"
+    repeated bool b = 5 [packed = true];         // "list(bool)"
+    repeated DataType type = 6 [packed = true];  // "list(type)"
+    repeated TensorShapeProto shape = 7;         // "list(shape)"
+    repeated TensorProto tensor = 8;             // "list(tensor)"
+    repeated NameAttrList func = 9;              // "list(attr)"
+  }
+  // LINT.ThenChange(https://www.tensorflow.org/code/tensorflow/c/c_api.cc)
+
+  oneof value {
+    bytes s = 2;                 // "string"
+    int64 i = 3;                 // "int"
+    float f = 4;                 // "float"
+    bool b = 5;                  // "bool"
+    DataType type = 6;           // "type"
+    TensorShapeProto shape = 7;  // "shape"
+    TensorProto tensor = 8;      // "tensor"
+    ListValue list = 1;          // any "list(...)"
+
+    // "func" represents a function. func.name is a function's name or
+    // a primitive op's name. func.attr.first is the name of an attr
+    // defined for that function. func.attr.second is the value for
+    // that attr in the instantiation.
+    NameAttrList func = 10;
+
+    // This is a placeholder only used in nodes defined inside a
+    // function.  It indicates the attr value will be supplied when
+    // the function is instantiated.  For example, let us suppose a
+    // node "N" in function "FN". "N" has an attr "A" with value
+    // placeholder = "foo". When FN is instantiated with attr "foo"
+    // set to "bar", the instantiated node N's attr A will have been
+    // given the value "bar".
+    string placeholder = 9;
+  }
+}
+
+// A list of attr names and their values. The whole list is attached
+// with a string name.  E.g., MatMul[T=float].
+message NameAttrList {
+  string name = 1;
+  map<string, AttrValue> attr = 2;
+}

src/tf/function.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "FunctionProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+import "attr_value.proto";
+import "node_def.proto";
+import "op_def.proto";
+
+// A library is a set of named functions.
+message FunctionDefLibrary {
+  repeated FunctionDef function = 1;
+  repeated GradientDef gradient = 2;
+}
+
+// A function can be instantiated when the runtime can bind every attr
+// with a value. When a GraphDef has a call to a function, it must
+// have binding for every attr defined in the signature.
+//
+// TODO(zhifengc):
+//   * device spec, etc.
+message FunctionDef {
+  // The definition of the function's name, arguments, return values,
+  // attrs etc.
+  OpDef signature = 1;
+
+  // Attributes specific to this function definition.
+  map<string, AttrValue> attr = 5;
+
+  // NOTE: field id 2 deleted on Jan 11, 2017, GraphDef version 21.
+  reserved 2;
+
+  // In both of the following fields, there is the need to specify an
+  // output that is used as either the input to another node (in
+  // `node_def`) or as a return value of the function (in `ret`).
+  // Unlike the NodeDefs in GraphDef, we need to be able to specify a
+  // list in some cases (instead of just single outputs).  Also, we
+  // need to be able to deal with lists of unknown length (so the
+  // output index may not be known at function definition time).  So
+  // we use the following format instead:
+  // * "fun_in" where "fun_in" is the name of a function input arg in
+  //   the `signature` field above.  This represents that input, whether
+  //   it is a single tensor or a list.
+  // * "fun_in:0" gives the first element of a function input arg (a
+  //   non-list input is considered a list of length 1 for these
+  //   purposes).
+  // * "node:out" where "node" is the name of a node in `node_def` and
+  //   "out" is the name one of its op's output arguments (the name
+  //   comes from the OpDef of the node's op). This represents that
+  //   node's output, whether it is a single tensor or a list.
+  //   Note: We enforce that an op's output arguments are never
+  //   renamed in the backwards-compatibility test.
+  // * "node:out:0" gives the first element of a node output arg (a
+  //   non-list output is considered a list of length 1 for these
+  //   purposes).
+  //
+  // NOT CURRENTLY SUPPORTED (but may be in the future):
+  // * "node:out:-1" gives last element in a node output list
+  // * "node:out:1:" gives a list with all but the first element in a
+  //   node output list
+  // * "node:out::-1" gives a list with all but the last element in a
+  //   node output list
+
+  // The body of the function.  Unlike the NodeDefs in a GraphDef, attrs
+  // may have values of type `placeholder` and the `input` field uses
+  // the "output" format above.
+
+  // By convention, "op" in node_def is resolved by consulting with a
+  // user-defined library first. If not resolved, "func" is assumed to
+  // be a builtin op.
+  repeated NodeDef node_def = 3;
+
+  // A mapping from the output arg names from `signature` to the
+  // outputs from `node_def` that should be returned by the function.
+  map<string, string> ret = 4;
+}
+
+// GradientDef defines the gradient function of a function defined in
+// a function library.
+//
+// A gradient function g (specified by gradient_func) for a function f
+// (specified by function_name) must follow the following:
+//
+// The function 'f' must be a numerical function which takes N inputs
+// and produces M outputs. Its gradient function 'g', which is a
+// function taking N + M inputs and produces N outputs.
+//
+// I.e. if we have
+//    (y1, y2, ..., y_M) = f(x1, x2, ..., x_N),
+// then, g is
+//    (dL/dx1, dL/dx2, ..., dL/dx_N) = g(x1, x2, ..., x_N,
+//                                      dL/dy1, dL/dy2, ..., dL/dy_M),
+// where L is a scalar-value function of (x1, x2, ..., xN) (e.g., the
+// loss function). dL/dx_i is the partial derivative of L with respect
+// to x_i.
+message GradientDef {
+  string function_name = 1;  // The function name.
+  string gradient_func = 2;  // The gradient function's name.
+}

src/tf/graph.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "GraphProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+import "node_def.proto";
+import "function.proto";
+import "versions.proto";
+
+// Represents the graph of operations
+message GraphDef {
+  repeated NodeDef node = 1;
+
+  // Compatibility versions of the graph.  See core/public/version.h for version
+  // history.  The GraphDef version is distinct from the TensorFlow version, and
+  // each release of TensorFlow will support a range of GraphDef versions.
+  VersionDef versions = 4;
+
+  // Deprecated single version field; use versions above instead.  Since all
+  // GraphDef changes before "versions" was introduced were forward
+  // compatible, this field is entirely ignored.
+  int32 version = 3 [deprecated = true];
+
+  // EXPERIMENTAL. DO NOT USE OR DEPEND ON THIS YET.
+  //
+  // "library" provides user-defined functions.
+  //
+  // Naming:
+  //   * library.function.name are in a flat namespace.
+  //     NOTE: We may need to change it to be hierarchical to support
+  //     different orgs. E.g.,
+  //     { "/google/nn", { ... }},
+  //     { "/google/vision", { ... }}
+  //     { "/org_foo/module_bar", { ... }}
+  //     map<string, FunctionDefLib> named_lib;
+  //   * If node[i].op is the name of one function in "library",
+  //     node[i] is deemed as a function call. Otherwise, node[i].op
+  //     must be a primitive operation supported by the runtime.
+  //
+  //
+  // Function call semantics:
+  //
+  //   * The callee may start execution as soon as some of its inputs
+  //     are ready. The caller may want to use Tuple() mechanism to
+  //     ensure all inputs are ready in the same time.
+  //
+  //   * The consumer of return values may start executing as soon as
+  //     the return values the consumer depends on are ready.  The
+  //     consumer may want to use Tuple() mechanism to ensure the
+  //     consumer does not start until all return values of the callee
+  //     function are ready.
+  FunctionDefLibrary library = 2;
+};

src/tf/node_def.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "NodeProto";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+import "attr_value.proto";
+
+message NodeDef {
+  // The name given to this operator. Used for naming inputs,
+  // logging, visualization, etc.  Unique within a single GraphDef.
+  // Must match the regexp "[A-Za-z0-9.][A-Za-z0-9_./]*".
+  string name = 1;
+
+  // The operation name.  There may be custom parameters in attrs.
+  // Op names starting with an underscore are reserved for internal use.
+  string op = 2;
+
+  // Each input is "node:src_output" with "node" being a string name and
+  // "src_output" indicating which output tensor to use from "node". If
+  // "src_output" is 0 the ":0" suffix can be omitted.  Regular inputs
+  // may optionally be followed by control inputs that have the format
+  // "^node".
+  repeated string input = 3;
+
+  // A (possibly partial) specification for the device on which this
+  // node should be placed.
+  // The expected syntax for this string is as follows:
+  //
+  // DEVICE_SPEC ::= PARTIAL_SPEC
+  //
+  // PARTIAL_SPEC ::= ("/" CONSTRAINT) *
+  // CONSTRAINT ::= ("job:" JOB_NAME)
+  //              | ("replica:" [1-9][0-9]*)
+  //              | ("task:" [1-9][0-9]*)
+  //              | ("device:" [A-Za-z]* ":" ([1-9][0-9]* | "*") )
+  //
+  // Valid values for this string include:
+  // * "/job:worker/replica:0/task:1/device:GPU:3"  (full specification)
+  // * "/job:worker/device:GPU:3"                   (partial specification)
+  // * ""                                    (no specification)
+  //
+  // If the constraints do not resolve to a single device (or if this
+  // field is empty or not present), the runtime will attempt to
+  // choose a device automatically.
+  string device = 4;
+
+  // Operation-specific graph-construction-time configuration.
+  // Note that this should include all attrs defined in the
+  // corresponding OpDef, including those with a value matching
+  // the default -- this allows the default to change and makes
+  // NodeDefs easier to interpret on their own.  However, if
+  // an attr with a default is not specified in this list, the
+  // default will be used.
+  // The "names" (keys) must match the regexp "[a-z][a-z0-9_]+" (and
+  // one of the names from the corresponding OpDef's attr field).
+  // The values must have a type matching the corresponding OpDef
+  // attr's type field.
+  // TODO(josh11b): Add some examples here showing best practices.
+  map<string, AttrValue> attr = 5;
+};

src/tf/op_def.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "OpDefProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+import "attr_value.proto";
+import "types.proto";
+
+// Defines an operation. A NodeDef in a GraphDef specifies an Op by
+// using the "op" field which should match the name of a OpDef.
+// LINT.IfChange
+message OpDef {
+  // Op names starting with an underscore are reserved for internal use.
+  // Names should be CamelCase and match the regexp "[A-Z][a-zA-Z0-9_]*".
+  string name = 1;
+
+  // For describing inputs and outputs.
+  message ArgDef {
+    // Name for the input/output.  Should match the regexp "[a-z][a-z0-9_]*".
+    string name = 1;
+
+    // Human readable description.
+    string description = 2;
+
+    // Describes the type of one or more tensors that are accepted/produced
+    // by this input/output arg.  The only legal combinations are:
+    // * For a single tensor: either the "type" field is set or the
+    //   "type_attr" field is set to the name of an attr with type "type".
+    // * For a sequence of tensors with the same type: the "number_attr"
+    //   field will be set to the name of an attr with type "int", and
+    //   either the "type" or "type_attr" field will be set as for
+    //   single tensors.
+    // * For a sequence of tensors, the "type_list_attr" field will be set
+    //   to the name of an attr with type "list(type)".
+    DataType type = 3;
+    string type_attr = 4;    // if specified, attr must have type "type"
+    string number_attr = 5;  // if specified, attr must have type "int"
+    // If specified, attr must have type "list(type)", and none of
+    // type, type_attr, and number_attr may be specified.
+    string type_list_attr = 6;
+
+    // For inputs: if true, the inputs are required to be refs.
+    //   By default, inputs can be either refs or non-refs.
+    // For outputs: if true, outputs are refs, otherwise they are not.
+    bool is_ref = 16;
+  };
+
+  // Description of the input(s).
+  repeated ArgDef input_arg = 2;
+
+  // Description of the output(s).
+  repeated ArgDef output_arg = 3;
+
+  // Description of the graph-construction-time configuration of this
+  // Op.  That is to say, this describes the attr fields that will
+  // be specified in the NodeDef.
+  message AttrDef {
+    // A descriptive name for the argument.  May be used, e.g. by the
+    // Python client, as a keyword argument name, and so should match
+    // the regexp "[a-z][a-z0-9_]+".
+    string name = 1;
+
+    // One of the type names from attr_value.proto ("string", "list(string)",
+    // "int", etc.).
+    string type = 2;
+
+    // A reasonable default for this attribute if the user does not supply
+    // a value.  If not specified, the user must supply a value.
+    AttrValue default_value = 3;
+
+    // Human-readable description.
+    string description = 4;
+
+    // TODO(josh11b): bool is_optional?
+
+    // --- Constraints ---
+    // These constraints are only in effect if specified.  Default is no
+    // constraints.
+
+    // For type == "int", this is a minimum value.  For "list(___)"
+    // types, this is the minimum length.
+    bool has_minimum = 5;
+    int64 minimum = 6;
+
+    // The set of allowed values.  Has type that is the "list" version
+    // of the "type" field above (uses the "list" field of AttrValue).
+    // If type == "type" or "list(type)" above, then the "type" field
+    // of "allowed_values.list" has the set of allowed DataTypes.
+    // If type == "string" or "list(string)", then the "s" field of
+    // "allowed_values.list" has the set of allowed strings.
+    AttrValue allowed_values = 7;
+  }
+  repeated AttrDef attr = 4;
+
+  // Optional deprecation based on GraphDef versions.
+  OpDeprecation deprecation = 8;
+
+  // One-line human-readable description of what the Op does.
+  string summary = 5;
+
+  // Additional, longer human-readable description of what the Op does.
+  string description = 6;
+
+  // -------------------------------------------------------------------------
+  // Which optimizations this operation can participate in.
+
+  // True if the operation is commutative ("op(a,b) == op(b,a)" for all inputs)
+  bool is_commutative = 18;
+
+  // If is_aggregate is true, then this operation accepts N >= 2
+  // inputs and produces 1 output all of the same type.  Should be
+  // associative and commutative, and produce output with the same
+  // shape as the input.  The optimizer may replace an aggregate op
+  // taking input from multiple devices with a tree of aggregate ops
+  // that aggregate locally within each device (and possibly within
+  // groups of nearby devices) before communicating.
+  // TODO(josh11b): Implement that optimization.
+  bool is_aggregate = 16;  // for things like add
+
+  // Other optimizations go here, like
+  //   can_alias_input, rewrite_when_output_unused, partitioning_strategy, etc.
+
+  // -------------------------------------------------------------------------
+  // Optimization constraints.
+
+  // Ops are marked as stateful if their behavior depends on some state beyond
+  // their input tensors (e.g. variable reading op) or if they have
+  // a side-effect (e.g. printing or asserting ops). Equivalently, stateless ops
+  // must always produce the same output for the same input and have
+  // no side-effects.
+  //
+  // By default Ops may be moved between devices.  Stateful ops should
+  // either not be moved, or should only be moved if that state can also
+  // be moved (e.g. via some sort of save / restore).
+  // Stateful ops are guaranteed to never be optimized away by Common
+  // Subexpression Elimination (CSE).
+  bool is_stateful = 17;  // for things like variables, queue
+
+  // -------------------------------------------------------------------------
+  // Non-standard options.
+
+  // By default, all inputs to an Op must be initialized Tensors.  Ops
+  // that may initialize tensors for the first time should set this
+  // field to true, to allow the Op to take an uninitialized Tensor as
+  // input.
+  bool allows_uninitialized_input = 19;  // for Assign, etc.
+};
+// LINT.ThenChange(
+//     https://www.tensorflow.org/code/tensorflow/core/framework/op_def_util.cc)
+
+// Information about version-dependent deprecation of an op
+message OpDeprecation {
+  // First GraphDef version at which the op is disallowed.
+  int32 version = 1;
+
+  // Explanation of why it was deprecated and what to use instead.
+  string explanation = 2;
+};
+
+// A collection of OpDefs
+message OpList {
+  repeated OpDef op = 1;
+};

src/tf/read_tf.cpp

+#include <migraphx/tf.hpp>
+
+int main(int argc, char const* argv[])
+{
+    if(argc > 1)
+    {
+        bool is_nhwc = true;
+        if(argc > 2)
+        {
+            if(argv[2] == "nchw")
+                is_nhwc = false;
+        }
+        std::string file = argv[1];
+        auto prog        = migraphx::parse_tf(file, is_nhwc);
+        std::cout << prog << std::endl;
+    }
+}

src/tf/resource_handle.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "ResourceHandle";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+
+// Protocol buffer representing a handle to a tensorflow resource. Handles are
+// not valid across executions, but can be serialized back and forth from within
+// a single run.
+message ResourceHandleProto {
+  // Unique name for the device containing the resource.
+  string device = 1;
+
+  // Container in which this resource is placed.
+  string container = 2;
+
+  // Unique name of this resource.
+  string name = 3;
+
+  // Hash code for the type of the resource. Is only valid in the same device
+  // and in the same execution.
+  uint64 hash_code = 4;
+
+  // For debug-only, the name of the type pointed to by this handle, if
+  // available.
+  string maybe_type_name = 5;
+};

src/tf/tensor.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "TensorProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+import "resource_handle.proto";
+import "tensor_shape.proto";
+import "types.proto";
+
+// Protocol buffer representing a tensor.
+message TensorProto {
+  DataType dtype = 1;
+
+  // Shape of the tensor.  TODO(touts): sort out the 0-rank issues.
+  TensorShapeProto tensor_shape = 2;
+
+  // Only one of the representations below is set, one of "tensor_contents" and
+  // the "xxx_val" attributes.  We are not using oneof because as oneofs cannot
+  // contain repeated fields it would require another extra set of messages.
+
+  // Version number.
+  //
+  // In version 0, if the "repeated xxx" representations contain only one
+  // element, that element is repeated to fill the shape.  This makes it easy
+  // to represent a constant Tensor with a single value.
+  int32 version_number = 3;
+
+  // Serialized raw tensor content from either Tensor::AsProtoTensorContent or
+  // memcpy in tensorflow::grpc::EncodeTensorToByteBuffer. This representation
+  // can be used for all tensor types. The purpose of this representation is to
+  // reduce serialization overhead during RPC call by avoiding serialization of
+  // many repeated small items.
+  bytes tensor_content = 4;
+
+  // Type specific representations that make it easy to create tensor protos in
+  // all languages.  Only the representation corresponding to "dtype" can
+  // be set.  The values hold the flattened representation of the tensor in
+  // row major order.
+
+  // DT_HALF, DT_BFLOAT16. Note that since protobuf has no int16 type, we'll
+  // have some pointless zero padding for each value here.
+  repeated int32 half_val = 13 [packed = true];
+
+  // DT_FLOAT.
+  repeated float float_val = 5 [packed = true];
+
+  // DT_DOUBLE.
+  repeated double double_val = 6 [packed = true];
+
+  // DT_INT32, DT_INT16, DT_INT8, DT_UINT8.
+  repeated int32 int_val = 7 [packed = true];
+
+  // DT_STRING
+  repeated bytes string_val = 8;
+
+  // DT_COMPLEX64. scomplex_val(2*i) and scomplex_val(2*i+1) are real
+  // and imaginary parts of i-th single precision complex.
+  repeated float scomplex_val = 9 [packed = true];
+
+  // DT_INT64
+  repeated int64 int64_val = 10 [packed = true];
+
+  // DT_BOOL
+  repeated bool bool_val = 11 [packed = true];
+
+  // DT_COMPLEX128. dcomplex_val(2*i) and dcomplex_val(2*i+1) are real
+  // and imaginary parts of i-th double precision complex.
+  repeated double dcomplex_val = 12 [packed = true];
+
+  // DT_RESOURCE
+  repeated ResourceHandleProto resource_handle_val = 14;
+
+  // DT_VARIANT
+  repeated VariantTensorDataProto variant_val = 15;
+
+  // DT_UINT32
+  repeated uint32 uint32_val = 16 [packed = true];
+
+  // DT_UINT64
+  repeated uint64 uint64_val = 17 [packed = true];
+};
+
+// Protocol buffer representing the serialization format of DT_VARIANT tensors.
+message VariantTensorDataProto {
+  // Name of the type of objects being serialized.
+  string type_name = 1;
+  // Portions of the object that are not Tensors.
+  bytes metadata = 2;
+  // Tensors contained within objects being serialized.
+  repeated TensorProto tensors = 3;
+}

src/tf/tensor_shape.proto

+// Protocol buffer representing the shape of tensors.
+
+syntax = "proto3";
+option cc_enable_arenas = true;
+option java_outer_classname = "TensorShapeProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+
+package tensorflow;
+
+// Dimensions of a tensor.
+message TensorShapeProto {
+  // One dimension of the tensor.
+  message Dim {
+    // Size of the tensor in that dimension.
+    // This value must be >= -1, but values of -1 are reserved for "unknown"
+    // shapes (values of -1 mean "unknown" dimension).  Certain wrappers
+    // that work with TensorShapeProto may fail at runtime when deserializing
+    // a TensorShapeProto containing a dim value of -1.
+    int64 size = 1;
+
+    // Optional name of the tensor dimension.
+    string name = 2;
+  };
+
+  // Dimensions of the tensor, such as {"input", 30}, {"output", 40}
+  // for a 30 x 40 2D tensor.  If an entry has size -1, this
+  // corresponds to a dimension of unknown size. The names are
+  // optional.
+  //
+  // The order of entries in "dim" matters: It indicates the layout of the
+  // values in the tensor in-memory representation.
+  //
+  // The first entry in "dim" is the outermost dimension used to layout the
+  // values, the last entry is the innermost dimension.  This matches the
+  // in-memory layout of RowMajor Eigen tensors.
+  //
+  // If "dim.size()" > 0, "unknown_rank" must be false.
+  repeated Dim dim = 2;
+
+  // If true, the number of dimensions in the shape is unknown.
+  //
+  // If true, "dim.size()" must be 0.
+  bool unknown_rank = 3;
+};

src/tf/tf.cpp

+#include <google/protobuf/text_format.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <graph.pb.h>
+#include <iostream>
+#include <fstream>
+#include <unordered_map>
+#include <unordered_set>
+#include <functional>
+#include <array>
+#include <utility>
+#include <vector>
+
+#include <migraphx/fallthrough.hpp>
+#include <migraphx/program.hpp>
+#include <migraphx/operators.hpp>
+#include <migraphx/ranges.hpp>
+#include <migraphx/instruction.hpp>
+#include <migraphx/config.hpp>
+#include <migraphx/tf.hpp>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+
+struct tf_parser
+{
+    using attribute_map = std::unordered_map<std::string, tensorflow::AttrValue>;
+    using node_map = std::unordered_map<std::string, tensorflow::NodeDef>;
+    // using input_node_map = std::unordered_map<std::string, std::unordered_set<std::string>>;
+    using op_func = std::function<instruction_ref(attribute_map, std::vector<instruction_ref>)>;
+    
+    node_map nodes;
+    std::vector<tensorflow::NodeDef> input_nodes;
+    std::unordered_map<std::string, instruction_ref> instructions;
+    program prog = program();
+    bool is_nhwc = true;
+
+    std::unordered_map<std::string, op_func> ops;
+
+    tf_parser()
+    {
+        add_generic_op("Identity", op::identity{});
+        add_generic_op("Relu", op::relu{});
+
+        add_binary_op("BiasAdd", op::add{});
+
+        // add_mem_op("AvgPool", &tf_parser::parse_pooling);
+        // add_mem_op("ConcatV2", &tf_parser::parse_concat);
+        add_mem_op("Const", &tf_parser::parse_constant);
+        add_mem_op("Conv2D", &tf_parser::parse_conv);
+        add_mem_op("FusedBatchNorm", &tf_parser::parse_batchnorm);
+    }
+
+    template <class F>
+    void add_mem_op(std::string name, F f)
+    {
+        ops.emplace(name, [=](auto&&... xs) {
+            return std::mem_fn(f)(*this, name, std::forward<decltype(xs)>(xs)...);
+        });
+    }
+
+    template <class T>
+    void add_binary_op(std::string name, T x)
+    {
+        ops.emplace(name, [this, x](attribute_map, std::vector<instruction_ref> args) {
+            if(args.size() != 2)
+                MIGRAPHX_THROW("binary operators should have 2 operands");
+            return add_broadcastable_binary_op(args[0], args[1], x);
+        });
+    }
+
+    template <class T>
+    instruction_ref add_broadcastable_binary_op(instruction_ref arg0, instruction_ref arg1, T x)
+    {
+        if(arg0->get_shape() != arg1->get_shape())
+        {
+            // Example:
+            // s0 = (3,2,4,5) and s1 = (2,1,1)
+            //
+            // In this case we need to broadcast (:,1,1) portion of
+            // s1 plus broadcast the 1st dimension of s1
+            // giving output_lens = (3,2,4,5)
+            //
+            // Another example:
+            // s0 = (3,2,1,5) and s1 = (2,7,5)
+            // In this case we need to broadcast the (:,:,1:,:) axis
+            // of s0 plus the 1st dimension of s1 giving
+            // output_lens = (3,2,7,5)
+            //
+            // Get lengths for both arguments
+            const std::vector<std::size_t>* s0 = &arg0->get_shape().lens();
+            const std::vector<std::size_t>* s1 = &arg1->get_shape().lens();
+
+            // Make sure s0 is the smaller size
+            if(s0->size() > s1->size())
+                std::swap(s0, s1);
+
+            std::vector<std::size_t> output_lens(*s1);
+            auto offset = s1->size() - s0->size();
+            std::transform(s0->begin(),
+                           s0->end(),
+                           s1->begin() + offset,
+                           output_lens.begin() + offset,
+                           [](auto a, auto b) { return std::max(a, b); });
+
+            auto l0 = prog.add_instruction(op::multibroadcast{output_lens}, arg0);
+            auto l1 = prog.add_instruction(op::multibroadcast{output_lens}, arg1);
+            return prog.add_instruction(x, l0, l1);
+        }
+        else
+        {
+            return prog.add_instruction(x, {arg0, arg1});
+        }
+    }
+
+    template <class T>
+    void add_generic_op(std::string name, T x)
+    {
+        ops.emplace(name, [this, x](attribute_map, std::vector<instruction_ref> args) {
+            return prog.add_instruction(x, args);
+        });
+    }
+
+    instruction_ref
+    parse_batchnorm(const std::string&, attribute_map attributes, std::vector<instruction_ref> args)
+    {
+        float epsilon                                     = 1e-4f;
+        float momentum                                    = 1.f;
+        op::batch_norm_inference::bn_infer_mode_t bn_mode = op::batch_norm_inference::spatial;
+        if(contains(attributes, "epsilon"))
+        {
+            epsilon = attributes.at("epsilon").f();
+        }
+        
+        op::batch_norm_inference op{epsilon, momentum, bn_mode};
+        return prog.add_instruction(op, std::move(args));
+    }
+
+    instruction_ref
+    parse_concat(const std::string&, attribute_map attributes, std::vector<instruction_ref> args)
+    {
+        // get index for axis within args
+        std::size_t axis_idx = attributes.at("N").i();
+        std::size_t axis = args[axis_idx]->eval().at<int64_t>();
+        op::concat op{axis};
+        return prog.add_instruction(op, std::move(args));
+    }
+
+    instruction_ref parse_constant(const std::string&,
+                                   attribute_map attributes,
+                                   const std::vector<instruction_ref>&)
+    {
+        literal v = parse_tensor(attributes.at("value").tensor());
+        return prog.add_literal(v);
+    }
+
+    instruction_ref
+    parse_conv(const std::string&, attribute_map attributes, std::vector<instruction_ref> args)
+    {
+        op::convolution op;
+        if(contains(attributes, "padding"))
+        {
+            const std::string& pad_mode = attributes.at("padding").s();
+            if(pad_mode.find("SAME") != std::string::npos)
+            {
+                op.padding_mode = op::convolution::same;
+            }
+            else if (pad_mode.find("EXPLICIT") != std::string::npos)
+            {
+                std::vector<std::size_t> padding(4);
+                copy(attributes.at("explicit_paddings").list().i(), padding.begin());
+                if(padding.size() != 4)
+                {
+                    MIGRAPHX_THROW("padding should have 4 values");
+                }
+                if(padding[0] != padding[2] || padding[1] != padding[3])
+                {
+                    MIGRAPHX_THROW("migraphx does not support asymetric padding");
+                }
+                op.padding[0] = padding[0];
+                op.padding[1] = padding[1];
+            }
+        }
+        if(contains(attributes, "strides"))
+        {
+            copy(attributes.at("strides").list().i(), op.stride.begin());
+        }
+        if(contains(attributes, "dilations"))
+        {
+            copy(attributes.at("dilations").list().i(), op.dilation.begin());
+        }
+
+        auto l0 = args[1];
+        if(is_nhwc)
+            l0 = prog.add_instruction(op::transpose{{0, 3, 1, 2}}, l0);
+        return prog.add_instruction(op, {args[0], l0});
+    }
+
+    // instruction_ref parse_pooling(const std::string& name,
+    //                               attribute_map attributes,
+    //                               std::vector<instruction_ref> args)
+    // {
+    //     op::pooling op{starts_with(name, "Max") ? "max" : "average"};
+        
+    //     if(contains(attributes, "pads"))
+    //     {
+    //         std::vector<std::size_t> padding(4);
+    //         copy(attributes["pads"].ints(), padding.begin());
+    //         if(padding.size() != 4)
+    //         {
+    //             MIGRAPHX_THROW("padding should have 4 values");
+    //         }
+    //         if(padding[0] != padding[2] || padding[1] != padding[3])
+    //         {
+    //             MIGRAPHX_THROW("migraphx does not support asymetric padding");
+    //         }
+    //         op.padding[0] = padding[0];
+    //         op.padding[1] = padding[1];
+    //     }
+    //     if(contains(attributes, "strides"))
+    //     {
+    //         copy(attributes["strides"].ints(), op.stride.begin());
+    //     }
+    //     if(contains(attributes, "kernel_shape"))
+    //     {
+    //         copy(attributes["kernel_shape"].ints(), op.lengths.begin());
+    //     }
+    //     if(contains(attributes, "auto_pad"))
+    //     {
+    //         auto s = attributes["auto_pad"].s();
+    //         if(to_upper(s) != "NOTSET")
+    //         {
+    //             MIGRAPHX_THROW("auto_pad is not supported for pooling");
+    //         }
+    //     }
+
+    //     return prog.add_instruction(op, std::move(args));
+    // }
+
+    void parse_from(std::istream& is)
+    {
+        tensorflow::GraphDef graph;
+        if(graph.ParseFromIstream(&is))
+        {
+            this->parse_graph(graph);
+        }
+        else
+        {
+            throw std::runtime_error("Failed reading");
+        }
+    }
+
+    void parse_graph(const tensorflow::GraphDef& graph)
+    {
+        nodes = get_nodes(graph, input_nodes);
+        for(auto&& input : input_nodes)
+        {
+            const std::string& name = input.name();
+            attribute_map input_attrs = get_attributes(input);
+            shape::type_t shape_type = parse_type(input_attrs.at("dtype").type());
+            std::vector<size_t> dims = parse_dims(input_attrs.at("shape").shape());
+            shape s = shape{shape_type, dims};
+            instructions[name] = prog.add_parameter(name, s);
+            if(is_nhwc)
+            {
+                // nhwc to nchw
+                prog.add_instruction(migraphx::op::transpose{{0, 3, 1, 2}}, instructions[name]);
+            }
+        }
+        for(auto&& p : nodes)
+        {
+            this->parse_node(get_name(p.second));
+        }
+    }
+
+    void parse_node(const std::string& name)
+    {
+        if(instructions.count(name) == 0)
+        {
+            auto&& node = nodes.at(name);
+            std::vector<instruction_ref> args;
+            std::cout << name << std::endl;
+
+            for(auto&& input : node.input())
+            {
+                if(nodes.count(input) > 0)
+                {
+                    auto&& iname = get_name(nodes.at(input));
+                    assert(name != iname);
+                    this->parse_node(iname);
+                    args.push_back(instructions.at(iname));
+                }
+                else
+                {
+                    args.push_back(instructions.at(input));
+                }
+            }
+            if(ops.count(node.op()) == 0)
+            {
+                instructions[name] = prog.add_instruction(unknown{node.op()}, args);
+            }
+            else
+            {
+                instructions[name] = ops[node.op()](get_attributes(node), args);
+            }
+        }
+    }
+
+    static attribute_map get_attributes(const tensorflow::NodeDef& node)
+    {
+        attribute_map result;
+        for (auto&& attr : node.attr())
+        {
+            result[attr.first] = attr.second;
+        }
+        return result;
+    }
+
+    static std::string get_name(const tensorflow::NodeDef& node)
+    {
+        return node.name();
+    }
+
+    static node_map get_nodes(const tensorflow::GraphDef& graph, std::vector<tensorflow::NodeDef>& input_nodes)
+    {
+        node_map result;
+        for(auto&& node : graph.node())
+        {
+            auto node_name = get_name(node);
+            // assume each node in graph has an associated name
+            if(node_name.empty())
+                MIGRAPHX_THROW("tf node with no name found");
+            result[node_name] = node;
+            if(node.op() == "Placeholder")
+            {
+                input_nodes.push_back(node);
+            }
+        }
+        return result;
+    }
+
+    static shape::type_t parse_type(const tensorflow::DataType t)
+    {
+        shape::type_t shape_type{};
+        switch(t)
+        {
+        case tensorflow::DataType::DT_INVALID:
+            break; // throw std::runtime_error("Unsupported type UNDEFINED");
+        case tensorflow::DataType::DT_FLOAT: shape_type = shape::float_type; break;
+        case tensorflow::DataType::DT_DOUBLE: shape_type = shape::double_type; break;
+        case tensorflow::DataType::DT_INT32: shape_type = shape::int32_type; break;
+        case tensorflow::DataType::DT_UINT8:
+            break; // throw std::runtime_error("Unsupported type UINT8");
+        case tensorflow::DataType::DT_INT16: shape_type = shape::int16_type; break;
+        case tensorflow::DataType::DT_INT8: shape_type = shape::int8_type; break;
+        case tensorflow::DataType::DT_STRING:
+            break; // throw std::runtime_error("Unsupported type STRING");
+        case tensorflow::DataType::DT_COMPLEX64:
+            break; // throw std::runtime_error("Unsupported type COMPLEX64");
+        case tensorflow::DataType::DT_INT64: shape_type = shape::int64_type; break;
+        case tensorflow::DataType::DT_BOOL:
+            break; // throw std::runtime_error("Unsupported type BOOL");
+        case tensorflow::DataType::DT_QINT8:
+            break; // throw std::runtime_error("Unsupported type QINT8");
+        case tensorflow::DataType::DT_QUINT8:
+            break; // throw std::runtime_error("Unsupported type QUINT8");
+        case tensorflow::DataType::DT_QINT32:
+            break; // throw std::runtime_error("Unsupported type QINT32");
+        case tensorflow::DataType::DT_BFLOAT16:
+            break; // throw std::runtime_error("Unsupported type BFLOAT16");
+        case tensorflow::DataType::DT_QINT16:
+            break; // throw std::runtime_error("Unsupported type QINT16");
+        case tensorflow::DataType::DT_QUINT16:
+            break; // throw std::runtime_error("Unsupported type QUINT16");
+        case tensorflow::DataType::DT_UINT16: shape_type = shape::uint16_type; break;
+        case tensorflow::DataType::DT_COMPLEX128:
+            break; // throw std::runtime_error("Unsupported type COMPLEX128");
+        case tensorflow::DataType::DT_HALF: shape_type = shape::half_type; break;
+        case tensorflow::DataType::DT_RESOURCE:
+            break; // throw std::runtime_error("Unsupported type RESOURCE");
+        case tensorflow::DataType::DT_VARIANT:
+            break; // throw std::runtime_error("Unsupported type VARIANT");
+        case tensorflow::DataType::DT_UINT32: shape_type = shape::uint32_type; break;
+        case tensorflow::DataType::DT_UINT64: shape_type = shape::uint64_type; break;
+        default:
+            break;
+        }
+        return shape_type;
+    }
+
+    static literal parse_tensor(const tensorflow::TensorProto t)
+    {
+        std::vector<size_t> dims = parse_dims(t.tensor_shape());
+        if(dims.empty())
+        {
+            dims = {1};
+        }
+
+        if(!t.tensor_content().empty()) // has raw data
+        {
+            const std::string&s = t.tensor_content();
+            switch(t.dtype())
+            {
+            case tensorflow::DataType::DT_INVALID: throw std::runtime_error("");
+            case tensorflow::DataType::DT_FLOAT: return literal{{shape::float_type, dims}, s.data()};
+            case tensorflow::DataType::DT_UINT8: throw std::runtime_error("");
+            case tensorflow::DataType::DT_INT8: return literal{{shape::int32_type, dims}, s.data()};
+            case tensorflow::DataType::DT_UINT16: return literal{{shape::int32_type, dims}, s.data()};
+            case tensorflow::DataType::DT_INT16: return literal{{shape::int32_type, dims}, s.data()};
+            case tensorflow::DataType::DT_INT32: return literal{{shape::int32_type, dims}, s.data()};
+            case tensorflow::DataType::DT_INT64: return literal{{shape::int64_type, dims}, s.data()};
+            case tensorflow::DataType::DT_STRING: throw std::runtime_error("");
+            case tensorflow::DataType::DT_BOOL: return literal{{shape::int32_type, dims}, s.data()};
+            case tensorflow::DataType::DT_HALF: return literal{{shape::half_type, dims}, s.data()};
+            case tensorflow::DataType::DT_DOUBLE: return literal{{shape::double_type, dims}, s.data()};
+            case tensorflow::DataType::DT_UINT32: throw std::runtime_error("");
+            case tensorflow::DataType::DT_UINT64: throw std::runtime_error("");
+            case tensorflow::DataType::DT_COMPLEX64: throw std::runtime_error("");
+            case tensorflow::DataType::DT_COMPLEX128: throw std::runtime_error("");
+            default:
+                break;
+            }
+            MIGRAPHX_THROW("Invalid tensor type");
+        }
+        switch(t.dtype())
+        {
+        case tensorflow::DataType::DT_INVALID: throw std::runtime_error("");
+        case tensorflow::DataType::DT_FLOAT:
+            return literal{{shape::float_type, dims}, t.float_val().begin(), t.float_val().end()};
+        case tensorflow::DataType::DT_UINT8: throw std::runtime_error("");
+        case tensorflow::DataType::DT_INT8:
+            return literal{{shape::int32_type, dims}, t.int_val().begin(), t.int_val().end()};
+        case tensorflow::DataType::DT_UINT16:
+            return literal{{shape::int32_type, dims}, t.int_val().begin(), t.int_val().end()};
+        case tensorflow::DataType::DT_INT16:
+            return literal{{shape::int32_type, dims}, t.int_val().begin(), t.int_val().end()};
+        case tensorflow::DataType::DT_INT32:
+            return literal{{shape::int32_type, dims}, t.int_val().begin(), t.int_val().end()};
+        case tensorflow::DataType::DT_INT64:
+            return literal{{shape::int64_type, dims}, t.int64_val().begin(), t.int64_val().end()};
+        case tensorflow::DataType::DT_STRING: throw std::runtime_error("");
+        case tensorflow::DataType::DT_BOOL:
+            return literal{{shape::int32_type, dims}, t.bool_val().begin(), t.bool_val().end()};
+        case tensorflow::DataType::DT_HALF:
+            return literal{{shape::half_type, dims}, t.half_val().begin(), t.half_val().end()};
+        case tensorflow::DataType::DT_DOUBLE:
+            return literal{
+                {shape::double_type, dims}, t.double_val().begin(), t.double_val().end()};
+        case tensorflow::DataType::DT_UINT32: throw std::runtime_error("");
+        case tensorflow::DataType::DT_UINT64: throw std::runtime_error("");
+        case tensorflow::DataType::DT_COMPLEX64: throw std::runtime_error("");
+        case tensorflow::DataType::DT_COMPLEX128: throw std::runtime_error("");
+        default:
+            break;
+        }
+        MIGRAPHX_THROW("Invalid tensor type");
+
+    }
+
+    static std::vector<size_t> parse_dims(const tensorflow::TensorShapeProto& s)
+    {
+        std::vector<size_t> dims;
+        auto input_dims = s.dim();
+        for(auto dim : input_dims)
+        {
+            dims.push_back(dim.size());
+        }
+        return dims;
+    }
+
+
+
+};
+
+program parse_tf(const std::string& name, bool is_nhwc)
+{
+    std::fstream input(name.c_str(), std::ios::in | std::ios::binary);
+    tf_parser parser;
+    parser.is_nhwc = is_nhwc;
+
+#ifndef NDEBUG
+    // Log the program when it can't be parsed
+    try
+    {
+        parser.parse_from(input);
+    }
+    catch(...)
+    {
+        std::cerr << parser.prog << std::endl;
+        throw;
+    }
+#else
+    parser.parse_from(input);
+#endif
+    return std::move(parser.prog);
+}
+
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx

src/tf/types.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "TypesProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+
+// LINT.IfChange
+enum DataType {
+  // Not a legal value for DataType.  Used to indicate a DataType field
+  // has not been set.
+  DT_INVALID = 0;
+
+  // Data types that all computation devices are expected to be
+  // capable to support.
+  DT_FLOAT = 1;
+  DT_DOUBLE = 2;
+  DT_INT32 = 3;
+  DT_UINT8 = 4;
+  DT_INT16 = 5;
+  DT_INT8 = 6;
+  DT_STRING = 7;
+  DT_COMPLEX64 = 8;  // Single-precision complex
+  DT_INT64 = 9;
+  DT_BOOL = 10;
+  DT_QINT8 = 11;     // Quantized int8
+  DT_QUINT8 = 12;    // Quantized uint8
+  DT_QINT32 = 13;    // Quantized int32
+  DT_BFLOAT16 = 14;  // Float32 truncated to 16 bits.  Only for cast ops.
+  DT_QINT16 = 15;    // Quantized int16
+  DT_QUINT16 = 16;   // Quantized uint16
+  DT_UINT16 = 17;
+  DT_COMPLEX128 = 18;  // Double-precision complex
+  DT_HALF = 19;
+  DT_RESOURCE = 20;
+  DT_VARIANT = 21;  // Arbitrary C++ data types
+  DT_UINT32 = 22;
+  DT_UINT64 = 23;
+
+  // Do not use!  These are only for parameters.  Every enum above
+  // should have a corresponding value below (verified by types_test).
+  DT_FLOAT_REF = 101;
+  DT_DOUBLE_REF = 102;
+  DT_INT32_REF = 103;
+  DT_UINT8_REF = 104;
+  DT_INT16_REF = 105;
+  DT_INT8_REF = 106;
+  DT_STRING_REF = 107;
+  DT_COMPLEX64_REF = 108;
+  DT_INT64_REF = 109;
+  DT_BOOL_REF = 110;
+  DT_QINT8_REF = 111;
+  DT_QUINT8_REF = 112;
+  DT_QINT32_REF = 113;
+  DT_BFLOAT16_REF = 114;
+  DT_QINT16_REF = 115;
+  DT_QUINT16_REF = 116;
+  DT_UINT16_REF = 117;
+  DT_COMPLEX128_REF = 118;
+  DT_HALF_REF = 119;
+  DT_RESOURCE_REF = 120;
+  DT_VARIANT_REF = 121;
+  DT_UINT32_REF = 122;
+  DT_UINT64_REF = 123;
+}
+// LINT.ThenChange(
+//    https://www.tensorflow.org/code/tensorflow/c/c_api.h,
+//    https://www.tensorflow.org/code/tensorflow/go/tensor.go,
+//    https://www.tensorflow.org/code/tensorflow/core/framework/tensor.cc,
+//    https://www.tensorflow.org/code/tensorflow/core/framework/types.h,
+//    https://www.tensorflow.org/code/tensorflow/core/framework/types.cc,
+//    https://www.tensorflow.org/code/tensorflow/python/framework/dtypes.py,
+//    https://www.tensorflow.org/code/tensorflow/python/framework/function.py)

src/tf/versions.proto

+syntax = "proto3";
+
+package tensorflow;
+option cc_enable_arenas = true;
+option java_outer_classname = "VersionsProtos";
+option java_multiple_files = true;
+option java_package = "org.tensorflow.framework";
+option go_package = "github.com/tensorflow/tensorflow/tensorflow/go/core/framework";
+
+// Version information for a piece of serialized data
+//
+// There are different types of versions for each type of data
+// (GraphDef, etc.), but they all have the same common shape
+// described here.
+//
+// Each consumer has "consumer" and "min_producer" versions (specified
+// elsewhere).  A consumer is allowed to consume this data if
+//
+//   producer >= min_producer
+//   consumer >= min_consumer
+//   consumer not in bad_consumers
+//
+message VersionDef {
+  // The version of the code that produced this data.
+  int32 producer = 1;
+
+  // Any consumer below this version is not allowed to consume this data.
+  int32 min_consumer = 2;
+
+  // Specific consumer versions which are disallowed (e.g. due to bugs).
+  repeated int32 bad_consumers = 3;
+};