Update index.rst (#532)

* Update index.rst

change 1 to None so the inference can run
Signed-off-by: xiaowuhu <[email protected]>

* Update index.rst

add comment
Signed-off-by: xiaowuhu <[email protected]>

Author: xiaowuhu

docs/index.rst

@@ -59,7 +59,7 @@ ONNX and finally uses *onnxruntime* to predict.
     from onnxmltools import convert_sklearn
     from onnxmltools.utils import save_model
     from onnxconverter_common.data_types import FloatTensorType
-    initial_type = [('float_input', FloatTensorType([1, 4]))]
+    initial_type = [('float_input', FloatTensorType([None, 4]))]  # using 'None' to support multiple input samples for pred
     onx = convert_sklearn(clr, initial_types=initial_type)
     save_model(onx, "rf_iris.onnx")