added nhwc case, addressed axis bounds checking

src/tf/tf.cpp

@@ -363,11 +363,21 @@ struct tf_parser
         int64_t axis = 0;
         if(contains(attributes, "axis"))
             axis = attributes.at("axis").i();
-        std::transform(
-            args.begin(),
-            args.end(),
-            std::back_inserter(unsqueezed_args),
-            [&](instruction_ref arg) { return prog.add_instruction(op::unsqueeze{{axis}}, arg); });
+        size_t input_size = args.front()->get_shape().lens().size();
+        if(axis > input_size)
+        {
+            MIGRAPHX_THROW("Error in protobuf: axis must be smaller than input size");
+        }
+        // check if input arg needs axis to be converted to NCHW
+        if(input_size >= 4)
+            axis = parse_axis(axis);
+
+        std::transform(args.begin(),
+                       args.end(),
+                       std::back_inserter(unsqueezed_args),
+                       [&](instruction_ref arg) {
+                           return prog.add_instruction(op::unsqueeze{{axis}}, arg);
+                       });
         return prog.add_instruction(op::concat{static_cast<size_t>(axis)}, unsqueezed_args);
     }
 

test/tf/pack_test_nhwc.pb

+
+:
+
0Placeholder*
+dtype0
*
+shape:



+:
+
1Placeholder*
+dtype0
*
+shape:



+:
+
2Placeholder*
+dtype0
*
+shape:



+4
+pack1Pack
0
1
2*
+
T0
*
+
+axis*
+
N"
\ No newline at end of file

test/tf/tf_test.cpp

@@ -151,6 +151,28 @@ TEST_CASE(pack_test)
     EXPECT(p == prog);
 }
 
+TEST_CASE(pack_test_nhwc)
+{
+    migraphx::program p;
+    auto l0 = p.add_parameter("0", migraphx::shape{migraphx::shape::float_type, {1,2,1,1}});
+    auto l1 = p.add_parameter("1", migraphx::shape{migraphx::shape::float_type, {1,2,1,1}});
+    auto l2 = p.add_parameter("2", migraphx::shape{migraphx::shape::float_type, {1,2,1,1}});
+    std::vector<migraphx::instruction_ref> args{l0, l1, l2};
+    std::vector<migraphx::instruction_ref> unsqueezed_args;
+    int64_t nchw_axis = 1;
+
+    std::transform(args.begin(),
+                   args.end(),
+                   std::back_inserter(unsqueezed_args),
+                   [&](migraphx::instruction_ref arg) {
+                       return p.add_instruction(migraphx::op::unsqueeze{{nchw_axis}}, arg);
+                   });
+    p.add_instruction(migraphx::op::concat{static_cast<size_t>(nchw_axis)}, unsqueezed_args);
+    auto prog = migraphx::parse_tf("pack_test_nhwc.pb", true);
+
+    EXPECT(p == prog);
+}
+
 TEST_CASE(pooling_test)
 {
     migraphx::program p;