Removed default time parameter from models, added ArgMax implementation

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

 <#assign input = element.inputs[0]>
 <#if mode == "FORWARD_FUNCTION">
-        ${element.name} = ${input}
+        ${element.name} = F.ndarray.argmax(${input}, keepdims=True)
 </#if>
\ No newline at end of file

src/test/resources/valid_tests/RNNencdec.cnna

@@ -14,7 +14,7 @@ architecture RNNencdec(max_length=50, vocabulary_size=30000, hidden_size=1000){
 
      encoder.state -> decoder.state;
 
-     timed<t=1> GreedySearch(max_length=50) {
+     timed<t> GreedySearch(max_length=50) {
          target[t-1] ->
          Embedding(output_dim=hidden_size) ->
          decoder ->

src/test/resources/valid_tests/RNNtest.cnna

@@ -4,7 +4,7 @@ architecture RNNtest(max_length=50, vocabulary_size=30000, hidden_size=1000){
 
        source -> Softmax() -> target[0];
 
-       timed <t=1> BeamSearchStart(max_length=5){
+       timed <t> BeamSearch(max_length=5){
            (target[0] | target[t-1]) ->
            Concatenate() ->
            FullyConnected(units=30000) ->