I did hybridize( ) and pass "valid_length" to the unroll( ) function of BidirectionalCell, then returned AssertionError in line 79. Because symbol.split( ) return a symbol but not a symbol list. Result in the length of inputs dont equal parameter "length"  when call unroll( )  to compute r_outputs and r_states.

I did hybridize( ) and pass "valid_length" to the unroll( ) function of BidirectionalCell, then returned AssertionError in line 79. Because symbol.split( ) return a symbol but not a symbol list. Result in the length of inputs dont equal parameter "length"  when call unroll( )  to compute r_outputs and r_states.

Fix the error of parameter.

I did hybridize( ) and pass "valid_length" to the unroll( ) function of BidirectionalCell, then returned AssertionError in line 79. Because symbol.split( ) return a symbol but not a symbol list. Result in the length of inputs dont equal parameter "length"  when call unroll( )  to compute r_outputs and r_states.