diff --git a/olive/hardware/constants.py b/olive/hardware/constants.py
index 9146e3891..2856fd120 100644
--- a/olive/hardware/constants.py
+++ b/olive/hardware/constants.py
@@ -28,7 +28,7 @@
         "MIGraphXExecutionProvider",
         "TensorrtExecutionProvider",
         "OpenVINOExecutionProvider",
-        "JsExecutionProvider"
+        "JsExecutionProvider",
     ],
     "npu": ["QNNExecutionProvider"],
 }
diff --git a/olive/passes/onnx/float32_conversion.py b/olive/passes/onnx/float32_conversion.py
index 6c63b691f..211a5ce12 100644
--- a/olive/passes/onnx/float32_conversion.py
+++ b/olive/passes/onnx/float32_conversion.py
@@ -2,33 +2,36 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 # --------------------------------------------------------------------------
+import logging
+import re
+from collections import defaultdict
 from pathlib import Path
-from typing import Any, Dict, List
+from typing import Any, Dict
 
-from collections import defaultdict
 import onnx
+
 from olive.hardware.accelerator import AcceleratorSpec
 from olive.model import ONNXModelHandler
 from olive.model.utils import resolve_onnx_path
 from olive.passes import Pass
 from olive.passes.onnx.common import get_external_data_config, model_proto_to_olive_model
 from olive.passes.pass_config import PassConfigParam
-import re
 
-class OnnxIOFloat16ToFloat32(Pass):
-    """Converts float16 model inputs/outputs to float32.
+logger = logging.getLogger(__name__)
+
 
-    """
+class OnnxIOFloat16ToFloat32(Pass):
+    """Converts float16 model inputs/outputs to float32."""
 
     @classmethod
     def _default_config(cls, accelerator_spec: AcceleratorSpec) -> Dict[str, PassConfigParam]:
         config = {
             "name_pattern": PassConfigParam(
-                type_=str, default_value="logits",
+                type_=str,
+                default_value="logits",
                 description=(
-                    "Only convert inputs/outputs whose name matches this pattern. By default"
-                    "looking for logits names"
-                )
+                    "Only convert inputs/outputs whose name matches this pattern. By defaultlooking for logits names"
+                ),
             )
         }
         config.update(get_external_data_config())
@@ -40,7 +43,7 @@ def create_io_mapping(self, graph, i_map, o_map):
                 i_map[i].append(n)
         for n in graph.node:
             for o in n.output:
-                assert o not in o_map[o]
+                assert o not in o_map
                 o_map[o] = [n]
 
     def wrap_inputs(self, graph, i_map, names):
@@ -54,7 +57,7 @@ def wrap_inputs(self, graph, i_map, names):
                 match = names.search(i.name)
                 if not match:
                     continue
-            print(f"input {i.name} from fp32")
+            logger.debug("input %s from fp32", i.name)
             for n in i_map[i.name]:
                 for j, o in enumerate(n.input):
                     if o == i.name:
@@ -63,12 +66,11 @@ def wrap_inputs(self, graph, i_map, names):
                 "Cast",
                 inputs=[i.name],
                 outputs=[i.name + "_fp16"],
-                to=onnx.TensorProto.FLOAT16,
+                to=onnx.TensorProto.FLOAT,
             )
             graph.node.insert(0, cast)
             i.type.tensor_type.elem_type = onnx.TensorProto.FLOAT
 
-
     def wrap_outputs(self, graph, i_map, o_map, names):
         # 1. find fp16 outputs
         # 2. rewrite all providers
@@ -80,7 +82,7 @@ def wrap_outputs(self, graph, i_map, o_map, names):
                 match = names.search(o.name)
                 if not match:
                     continue
-            print(f"output {o.name} to fp32")
+            logger.debug("output %s from fp32", o.name)
             for n in o_map[o.name]:
                 for j, i in enumerate(n.output):
                     if i == o.name:
diff --git a/test/unit_test/passes/onnx/test_float32_conversion.py b/test/unit_test/passes/onnx/test_float32_conversion.py
new file mode 100644
index 000000000..a0385aeee
--- /dev/null
+++ b/test/unit_test/passes/onnx/test_float32_conversion.py
@@ -0,0 +1,47 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+# --------------------------------------------------------------------------
+from olive.model.handler.onnx import ONNXModelHandler
+from olive.passes.olive_pass import create_pass_from_dict
+from olive.passes.onnx.float32_conversion import OnnxIOFloat16ToFloat32
+from test.unit_test.utils import get_onnx_model
+import onnx
+from onnx import helper
+from onnx import TensorProto
+
+
+def test_onnx_io_ft16_to_ft32_conversion(tmp_path):
+    # setup
+    node1 = helper.make_node(
+        'Add',
+        ['logits_A', 'logits_B'],
+        ['logits_C'],
+        name='add_node'
+    )
+
+    input_tensor_A = helper.make_tensor_value_info('logits_A', TensorProto.FLOAT16, [None])
+    input_tensor_B = helper.make_tensor_value_info('logits_B', TensorProto.FLOAT16, [None])
+    output_tensor_C = helper.make_tensor_value_info('logits_C', TensorProto.FLOAT16, [None])
+
+    graph = helper.make_graph(
+        [node1], 
+        'example_graph', 
+        [input_tensor_A, input_tensor_B], 
+        [output_tensor_C]
+    )
+    onnx_model = helper.make_model(graph, producer_name='example_producer')
+    tmp_model_path = str(tmp_path / "model.onnx")
+    onnx.save(onnx_model, tmp_model_path)
+    input_model = ONNXModelHandler(model_path=tmp_model_path)
+    p = create_pass_from_dict(OnnxIOFloat16ToFloat32, None, disable_search=True)
+    output_folder = str(tmp_path / "onnx")
+
+    # execute
+    output_model = p.run(input_model, None, output_folder)
+
+    # assert
+    for input in output_model.get_graph().input:
+        assert input.type.tensor_type.elem_type == onnx.TensorProto.FLOAT
+    for output in output_model.get_graph().output:
+        assert output.type.tensor_type.elem_type == onnx.TensorProto.FLOAT
\ No newline at end of file