constructor(keyDType, valueDType){
        this.keyDType = keyDType;
        this.valueDType = valueDType;
        this.handle = (0, _tfjsCore.scalar)(0);
        // tslint:disable-next-line: no-any
        this.tensorMap = new Map();
        (0, _tfjsCore.keep)(this.handle);
    }
Constructor of HashTable. Creates a hash table.

@param keyDType `dtype` of the table keys.
@param valueDType `dtype` of the table values.