Fixed bug in Const layer template

src/main/resources/templates/gluon/elements/Const.ftl

 <#if mode == "FORWARD_FUNCTION">
-        ${element.name} = gluon.Const('${element.name}', ${element.constValue})
+        ${element.name} = gluon.Constant('${element.name}', ${element.constValue})
 <#elseif mode == "PYTHON_INLINE">
-                    ${element.name} = nd.array(${element.constValue})
+                    ${element.name} = mx.nd.full((batch_size, 1,), ${element.constValue}, ctx=mx_context)
 <#elseif mode == "CPP_INLINE">
     vector<float> ${element.name}{${element.constValue}};
 </#if>
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