Inconsistent results of materials query

[fxcoudert]

Python version

3.12.8

Pymatgen version

2025.1.24

Operating system version

macOS 15.2

Current behavior

The following code:

with MPRester(apikey) as mpr:
    mp_data = mpr.materials.summary.search(
        fields=["material_id", "deprecated", "formula_pretty", "nelements", "structure", "theoretical", "symmetry"]
    )
    print("Number of materials found:", len(mp_data))
    print("Database version", mpr.get_database_version())

returns

Number of materials found: 178580
Database version 2024.12.18

Of these, there are 169385 non deprecated materials, as returned by:

> sum(1 for x in mp_data if not x.deprecated)

This is consistent with the number of the web portal. Good. But now, consider this:

with MPRester(apikey) as mpr:
    mp_data = mpr.materials.summary.search(
        deprecated=False,
        fields=["material_id", "deprecated", "formula_pretty", "nelements", "structure", "theoretical", "symmetry"]
    )
    print("Number of materials found:", len(mp_data))
    print("Database version", mpr.get_database_version())

It is exactly the same query, except I ask for all non deprecated by passing deprecated=False. But it now returns:

Number of materials found: 153902
Database version 2024.12.18

Expected Behavior

I expect the two routes to return the same number (and same list) of non deprecated materials.

Minimal example

Relevant files to reproduce this bug

No response

[Andrew-S-Rosen]

Hi @fxcoudert! Just to check --- was this meant for pymatgen or for https://github.com/materialsproject/api? I want to make sure you get the quickest feedback possible.

CC @tschaume in case it's relevant to him.

[tschaume]

Thanks @Andrew-S-Rosen! The difference is due to the new ~15k GNoMe materials that are included in the API response if a user accepted its terms on the website. You can set include_gnome=False in mpr.materials.summary.search() to exclude GNoMe materials regardless of whether their terms have been accepted or not. HTH

[Andrew-S-Rosen]

The all-knowing Patrick has spoken!!

[fxcoudert]

Thanks @tschaume. I don't know if I have accepted the new terms or not, but what I am sure is that both queries were made at the same time, with the same function. So whether the terms were accepted or not, shouldn't the numbers be consistent? (169k in the first case, 154 in the second case)

PS: how can I check whether I have accepted the new terms or not? I can't seem to find the information in the dashboard for my account.

Re. @Andrew-S-Rosen: I have no idea if it is an API bug or a pymatgen bug. I have only queried through the pymatgen functions, not tried directly the API from another code.