def decode(obj):
    """
    Decoder for deserializing numpy data types.
    """

    typ = obj.get('typ')
    if typ is None:
        return obj
    elif typ == 'timestamp':
        freq = obj['freq'] if 'freq' in obj else obj['offset']
        return Timestamp(obj['value'], tz=obj['tz'], freq=freq)
    elif typ == 'nat':
        return NaT
    elif typ == 'period':
        return Period(ordinal=obj['ordinal'], freq=obj['freq'])
    elif typ == 'index':
        dtype = dtype_for(obj['dtype'])
        data = unconvert(obj['data'], dtype,
                         obj.get('compress'))
        return Index(data, dtype=dtype, name=obj['name'])
    elif typ == 'range_index':
        return RangeIndex(obj['start'],
                          obj['stop'],
                          obj['step'],
                          name=obj['name'])
    elif typ == 'multi_index':
        dtype = dtype_for(obj['dtype'])
        data = unconvert(obj['data'], dtype,
                         obj.get('compress'))
        data = [tuple(x) for x in data]
        return MultiIndex.from_tuples(data, names=obj['names'])
    elif typ == 'period_index':
        data = unconvert(obj['data'], np.int64, obj.get('compress'))
        d = dict(name=obj['name'], freq=obj['freq'])
        freq = d.pop('freq', None)
        return PeriodIndex(PeriodArray(data, freq), **d)

    elif typ == 'datetime_index':
        data = unconvert(obj['data'], np.int64, obj.get('compress'))
        d = dict(name=obj['name'], freq=obj['freq'])
        result = DatetimeIndex(data, **d)
        tz = obj['tz']

        # reverse tz conversion
        if tz is not None:
            result = result.tz_localize('UTC').tz_convert(tz)
        return result

    elif typ in ('interval_index', 'interval_array'):
        return globals()[obj['klass']].from_arrays(obj['left'],
                                                   obj['right'],
                                                   obj['closed'],
                                                   name=obj['name'])
    elif typ == 'category':
        from_codes = globals()[obj['klass']].from_codes
        return from_codes(codes=obj['codes'],
                          categories=obj['categories'],
                          ordered=obj['ordered'])

    elif typ == 'interval':
        return Interval(obj['left'], obj['right'], obj['closed'])
    elif typ == 'series':
        dtype = dtype_for(obj['dtype'])
        pd_dtype = pandas_dtype(dtype)

        index = obj['index']
        result = Series(unconvert(obj['data'], dtype, obj['compress']),
                        index=index,
                        dtype=pd_dtype,
                        name=obj['name'])
        return result

    elif typ == 'block_manager':
        axes = obj['axes']

        def create_block(b):
            values = _safe_reshape(unconvert(
                b['values'], dtype_for(b['dtype']),
                b['compress']), b['shape'])

            # locs handles duplicate column names, and should be used instead
            # of items; see GH 9618
            if 'locs' in b:
                placement = b['locs']
            else:
                placement = axes[0].get_indexer(b['items'])

            if is_datetime64tz_dtype(b['dtype']):
                assert isinstance(values, np.ndarray), type(values)
                assert values.dtype == 'M8[ns]', values.dtype
                values = DatetimeArray(values, dtype=b['dtype'])

            return make_block(values=values,
                              klass=getattr(internals, b['klass']),
                              placement=placement,
                              dtype=b['dtype'])

        blocks = [create_block(b) for b in obj['blocks']]
        return globals()[obj['klass']](BlockManager(blocks, axes))
    elif typ == 'datetime':
        return parse(obj['data'])
    elif typ == 'datetime64':
        return np.datetime64(parse(obj['data']))
    elif typ == 'date':
        return parse(obj['data']).date()
    elif typ == 'timedelta':
        return timedelta(*obj['data'])
    elif typ == 'timedelta64':
        return np.timedelta64(int(obj['data']))
    # elif typ == 'sparse_series':
    #    dtype = dtype_for(obj['dtype'])
    #    return SparseSeries(
    #        unconvert(obj['sp_values'], dtype, obj['compress']),
    #        sparse_index=obj['sp_index'], index=obj['index'],
    #        fill_value=obj['fill_value'], kind=obj['kind'], name=obj['name'])
    # elif typ == 'sparse_dataframe':
    #    return SparseDataFrame(
    #        obj['data'], columns=obj['columns'],
    #        default_fill_value=obj['default_fill_value'],
    #        default_kind=obj['default_kind']
    #    )
    # elif typ == 'sparse_panel':
    #    return SparsePanel(
    #        obj['data'], items=obj['items'],
    #        default_fill_value=obj['default_fill_value'],
    #        default_kind=obj['default_kind'])
    elif typ == 'block_index':
        return globals()[obj['klass']](obj['length'], obj['blocs'],
                                       obj['blengths'])
    elif typ == 'int_index':
        return globals()[obj['klass']](obj['length'], obj['indices'])
    elif typ == 'ndarray':
        return unconvert(obj['data'], np.typeDict[obj['dtype']],
                         obj.get('compress')).reshape(obj['shape'])
    elif typ == 'np_scalar':
        if obj.get('sub_typ') == 'np_complex':
            return c2f(obj['real'], obj['imag'], obj['dtype'])
        else:
            dtype = dtype_for(obj['dtype'])
            try:
                return dtype(obj['data'])
            except (ValueError, TypeError):
                return dtype.type(obj['data'])
    elif typ == 'np_complex':
        return complex(obj['real'] + '+' + obj['imag'] + 'j')
    elif isinstance(obj, (dict, list, set)):
        return obj
    else:
        return obj
Decoder for deserializing numpy data types.