Hello,

This is similar to the open issue #79.
Some more observations.
Initially had trouble writing to JSON, however, with the latest release that looks fine.
I am still unable to write to PCS using pcs_new.write getting an error:
TypeError: sequence item 0: expected str instance, int found

Also, I tried to run the source code manually and observed the following:
[amsgrad | model_optimizer == 'adam',
momentum | model_optimizer == 'sgd',
channel_2 | n_conv_layer in {2, 3},
channel_3 | n_conv_layer == 3,
kernel_2 | n_conv_layer in {2, 3},
kernel_3 | n_conv_layer == 3,
padding_2 | n_conv_layer in {2, 3},
padding_3 | n_conv_layer == 3,
stride_2 | n_conv_layer in {2, 3},
stride_3 | n_conv_layer == 3,
(maxpool_2 | n_conv_layer in {2, 3} && maxpool_2 | stride_2 != 2),
(maxpool_3 | n_conv_layer in {2, 3} && maxpool_3 | stride_3 != 2),
(maxpool_kernel_2 | n_conv_layer in {2, 3} && maxpool_kernel_2 | maxpool_2 == 'True'),
(maxpool_kernel_3 | n_conv_layer in {2, 3} && maxpool_kernel_3 | maxpool_3 == 'True'),
maxpool_1 | stride_1 != 2,
maxpool_kernel_1 | maxpool_1 == 'True']

On running the conditional clauses with IN, such as
padding_2 | n_conv_layer in {2, 3}
stride_3 | n_conv_layer == 3
with condition_lines.write(build_condition(condition)) gives the following error:

TypeError Traceback (most recent call last)
in ()
----> 1 condition_lines.write(build_condition(condition))
in build_condition(condition)
133 return in_template % (condition.child.name,
134 condition.parent.name,
--> 135 ", ".join(condition.values))
136
137 elif isinstance(condition, EqualsCondition):
TypeError: sequence item 0: expected str instance, int found

On running the forbidden clauses with IN, such as
(maxpool_3 | n_conv_layer in {2, 3} && maxpool_3 | stride_3 != 2)
(maxpool_kernel_2 | n_conv_layer in {2, 3} && maxpool_kernel_2 | maxpool_2 == 'True')
with condition_lines.write(build_conjunction(condition)) gives the following error:

AttributeError Traceback (most recent call last)
in ()
----> 1 condition_lines.write(build_conjunction(condition))
in build_conjunction(conjunction)
153
154 cond_list = list()
--> 155 for component in conjunction.components:
156 tmp = build_condition(component.get_descendant_literal_conditions()[0])
157
AttributeError: 'ConfigSpace.conditions.NotEqualsCondition' object has no attribute 'components'

I believe a similar issue might also exist with the pcs_new.read since CAVE runs fail to read any configspace file with such cases.

Thanks.