Mesa.discrete_space not found

[Copepote]

Hello,

I am currently working on a project (fishers at sea) and I wanted to use the property layer portrayal (to display the fish stock available in each cell).

For some context: I had started this project using a MultiGrid, and while it runs, the property layer portayal that I defined doesnt show (I just have a blank background when I should have a something blue):

def agent_portrayal(agent):
    marker = "o"
    size = 10
    color = "tab:red"
    if agent.fish_any_weather :
        color = "tab:blue"
    return {"marker": marker, "size": size, "color": color}

propertylayer_portrayal = {
    "carrying_capacity": {"color": "blue", "alpha": 1, "colorbar": True, "vmin": 0, "vmax": 20},
}


fishing_space = make_mpl_space_component(
    agent_portrayal=agent_portrayal,
    propertylayer_portrayal=propertylayer_portrayal,
    post_process=None,
    draw_grid=False
)

#%%
blocked_areas =[(3,3), (3,4), (4,3), (4,4)]

model_params = {
    "width": 10,
    "height": 10,
    "num_fishers_per_class": {
        "type": "SliderInt",
        "value": 50,
        "label": "Number of fishers per fleet:",
        "min": 10,
        "max": 100,
        "step": 1,
    },
    "areas_blocked": blocked_areas,
    "seed": None,
}


# Create initial model instance
fisheries_model = FisheryModel(width=50, height=50, num_fishers_per_class = 50, areas_blocked = blocked_areas, seed=None) #keyword arguments

agent_data = fisheries_model.datacollector.get_agent_vars_dataframe()


fish_stock_plot = make_plot_component("Fish Stock")

components =[fishing_space, fish_stock_plot]

fisheries_reactive_model = solara.reactive(fisheries_model)
page = SolaraViz(
    fisheries_reactive_model,
    components=components,
    model_params=model_params,
    name="Fisheries",
)

page

My little fishers are here and moving correctly according to the carrying capacity layer I defined, but it doesn't display.

So i decided to switch to a OrthogonalVonNeumannGrid as it is the only grid used in the examples I saw that use the propertylayer portrayal (sugarscape, GoL, etc.).

My problem is:
from mesa.discrete_space import OrthogonalVonNeumannGrid from mesa.discrete_space.property_layer import PropertyLayer
doesn't work because mesa.discrete_space is not found.

I am working with Mesa 3.1.4 and Python 3.11.9

I had understood from the recent commits that discrete_spae had been moved in the main code, but maybe not yet ?

And is it possible to display property layers using a multigrid and not a OrthogonalVonNeumannGrid ?

Thank you!

[quaquel]

You probably looked at the examples here or on read the docs which defaults to latest instead of stable.

As part of 3.2 development, we are stablizing the new cell spaces. However, in 3.14, they are still located in mesa.experimental.cell_space. See also readthedocs for stable: https://mesa.readthedocs.io/stable/

[Copepote]

Right you are! Thanks for the quick response.

Is there no way to make a property layer portrayal using a multi grid for the moment then ?

[JJC022]

I notice that you have a size parameter in your agent_portrayals. I have been working on a model that includes optimizing the placement of buildings / benches in a campus environment. My present understanding is that mesa does not define the size / shape of individual agents relative to the space.

If you have a custom implementation or if I'm missing something I would love to hear about it. I'm also happy to share more of my thoughts on this question if you're interested.

[Copepote]

Hi ! I haven't spent too much time on the agent visualization itself, I was more interested in the space they evolved in. But if I do end up doing something for the agents I will make sure to share :))