Hex2vec embedder

Run this notebook in Google Colab:

Remember to install the srai library before running the notebook:

%pip install srai[all]

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import warnings

import matplotlib.pyplot as plt
import pandas as pd
from pytorch_lightning import seed_everything
from pytorch_lightning.loggers import CSVLogger
from srai.embedders import Hex2VecEmbedder
from srai.joiners import IntersectionJoiner
from srai.loaders import OSMOnlineLoader
from srai.neighbourhoods import H3Neighbourhood
from srai.plotting import plot_numeric_data, plot_regions
from srai.regionalizers import H3Regionalizer, geocode_to_region_gdf
import warnings

import matplotlib.pyplot as plt
import pandas as pd
from pytorch_lightning import seed_everything
from pytorch_lightning.loggers import CSVLogger
from srai.embedders import Hex2VecEmbedder
from srai.joiners import IntersectionJoiner
from srai.loaders import OSMOnlineLoader
from srai.neighbourhoods import H3Neighbourhood
from srai.plotting import plot_numeric_data, plot_regions
from srai.regionalizers import H3Regionalizer, geocode_to_region_gdf

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SEED = 71
seed_everything(SEED)
SEED = 71
seed_everything(SEED)

Seed set to 71

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Load data from OSM¶

First use geocoding to get the area

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area_gdf = geocode_to_region_gdf("Wrocław, Poland")
plot_regions(area_gdf, tiles_style="CartoDB positron")
area_gdf = geocode_to_region_gdf("Wrocław, Poland")
plot_regions(area_gdf, tiles_style="CartoDB positron")

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Next, download the data for the selected region and the specified tags. We're using OSMOnlineLoader here, as it's faster for low numbers of tags. In a real life scenario with more tags, you would likely want to use the OSMPbfLoader.

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tags = {
    "leisure": "park",
    "landuse": "forest",
    "amenity": ["bar", "restaurant", "cafe"],
    "water": "river",
    "sport": "soccer",
}
loader = OSMOnlineLoader()

features_gdf = loader.load(area_gdf, tags)

folium_map = plot_regions(
    area_gdf, colormap=["rgba(0,0,0,0)"], tiles_style="CartoDB positron"
)
features_gdf.explore(m=folium_map)
tags = {
    "leisure": "park",
    "landuse": "forest",
    "amenity": ["bar", "restaurant", "cafe"],
    "water": "river",
    "sport": "soccer",
}
loader = OSMOnlineLoader()

features_gdf = loader.load(area_gdf, tags)

folium_map = plot_regions(
    area_gdf, colormap=["rgba(0,0,0,0)"], tiles_style="CartoDB positron"
)
features_gdf.explore(m=folium_map)

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Prepare the data for embedding¶

After downloading the data, we need to prepare it for embedding. Namely - we need to regionalize the selected area, and join the features with regions.

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regionalizer = H3Regionalizer(resolution=9)
regions_gdf = regionalizer.transform(area_gdf)
plot_regions(regions_gdf, tiles_style="CartoDB positron")
regionalizer = H3Regionalizer(resolution=9)
regions_gdf = regionalizer.transform(area_gdf)
plot_regions(regions_gdf, tiles_style="CartoDB positron")

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joiner = IntersectionJoiner()
joint_gdf = joiner.transform(regions_gdf, features_gdf)
joint_gdf
joiner = IntersectionJoiner()
joint_gdf = joiner.transform(regions_gdf, features_gdf)
joint_gdf

Out[6]:


region_id	feature_id
891e2040897ffff	node/280727473
891e2040d4bffff	node/300461026
891e2040d4bffff	node/300461036
891e2040d5bffff	node/300461042
891e2040887ffff	node/300461045
...	...
891e204098fffff	way/1437139462
891e20409bbffff	way/1437139462
891e2042447ffff	way/1442991568
891e204240bffff	way/1442991568
891e204241bffff	way/1442991568

4196 rows × 0 columns

Embedding¶

After preparing the data we can proceed with generating embeddings for the regions.

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neighbourhood = H3Neighbourhood(regions_gdf)
embedder = Hex2VecEmbedder([15, 10])

csv_logger = CSVLogger(save_dir="hex2vec_logs")

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    embeddings = embedder.fit_transform(
        regions_gdf,
        features_gdf,
        joint_gdf,
        neighbourhood,
        trainer_kwargs={"max_epochs": 5, "accelerator": "cpu", "logger": csv_logger},
        batch_size=100,
    )
embeddings
neighbourhood = H3Neighbourhood(regions_gdf)
embedder = Hex2VecEmbedder([15, 10])

csv_logger = CSVLogger(save_dir="hex2vec_logs")

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    embeddings = embedder.fit_transform(
        regions_gdf,
        features_gdf,
        joint_gdf,
        neighbourhood,
        trainer_kwargs={"max_epochs": 5, "accelerator": "cpu", "logger": csv_logger},
        batch_size=100,
    )
embeddings

GPU available: False, used: False

TPU available: False, using: 0 TPU cores

HPU available: False, using: 0 HPUs

  | Name    | Type       | Params | Mode 
-----------------------------------------------
0 | encoder | Sequential | 280    | train
-----------------------------------------------
280       Trainable params
0         Non-trainable params
280       Total params
0.001     Total estimated model params size (MB)
4         Modules in train mode
0         Modules in eval mode

`Trainer.fit` stopped: `max_epochs=5` reached.

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	0	1	2	3	4	5	6	7	8	9
region_id
891e2041bd7ffff	0.304934	-0.246910	-0.045896	0.301652	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146
891e2047087ffff	-0.275322	0.103542	-0.319135	-0.444761	0.040767	0.222165	-0.401774	0.350615	-0.142410	0.006874
891e2041db7ffff	0.444362	-0.293634	0.116565	0.298231	0.125056	-0.142197	0.051374	-0.331443	-0.068522	0.223158
891e2046667ffff	0.304934	-0.246910	-0.045896	0.301652	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146
891e2040d87ffff	0.277351	-0.265826	0.151163	0.511726	0.199198	-0.174101	-0.003378	-0.190494	0.032990	0.336151
...	...	...	...	...	...	...	...	...	...	...
891e2040693ffff	0.304934	-0.246910	-0.045896	0.301652	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146
891e2040eafffff	0.444362	-0.293634	0.116565	0.298231	0.125056	-0.142197	0.051374	-0.331443	-0.068522	0.223158
891e204062fffff	0.304934	-0.246910	-0.045896	0.301653	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146
891e2042b03ffff	0.045778	0.063707	0.438936	0.573166	-0.174856	-0.000273	0.291727	-0.377283	0.402997	0.112393
891e204708fffff	-0.421047	0.041041	-0.354687	-0.915405	-0.086334	0.285789	-0.091117	0.487679	-0.223118	-0.399057

3168 rows × 10 columns

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metrics_df = pd.read_csv(csv_logger.log_dir + "/metrics.csv").dropna(
    subset="train_f1_epoch"
)

fig, ax1 = plt.subplots(1, 1, figsize=(10, 5))
ax2 = ax1.twinx()

line1 = ax1.plot(metrics_df["epoch"], metrics_df["train_f1_epoch"])
line2 = ax2.plot(metrics_df["epoch"], metrics_df["train_loss_epoch"], color="orange")
ax1.legend(line1 + line2, ["F1", "Loss"], loc=7)
ax1.set_title("Training metrics")
ax1.set_ylabel("F1")
ax2.set_ylabel("Loss")
ax1.set_xlabel("Training epoch")
plt.show()
metrics_df = pd.read_csv(csv_logger.log_dir + "/metrics.csv").dropna(
    subset="train_f1_epoch"
)

fig, ax1 = plt.subplots(1, 1, figsize=(10, 5))
ax2 = ax1.twinx()

line1 = ax1.plot(metrics_df["epoch"], metrics_df["train_f1_epoch"])
line2 = ax2.plot(metrics_df["epoch"], metrics_df["train_loss_epoch"], color="orange")
ax1.legend(line1 + line2, ["F1", "Loss"], loc=7)
ax1.set_title("Training metrics")
ax1.set_ylabel("F1")
ax2.set_ylabel("Loss")
ax1.set_xlabel("Training epoch")
plt.show()

No description has been provided for this image

Visualizing the embeddings' similarity¶

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from sklearn.cluster import KMeans

clusterizer = KMeans(n_clusters=5, random_state=SEED)
clusterizer.fit(embeddings)

embeddings["cluster"] = clusterizer.labels_
embeddings
from sklearn.cluster import KMeans

clusterizer = KMeans(n_clusters=5, random_state=SEED)
clusterizer.fit(embeddings)

embeddings["cluster"] = clusterizer.labels_
embeddings

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	0	1	2	3	4	5	6	7	8	9	cluster
region_id
891e2041bd7ffff	0.304934	-0.246910	-0.045896	0.301652	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146	0
891e2047087ffff	-0.275322	0.103542	-0.319135	-0.444761	0.040767	0.222165	-0.401774	0.350615	-0.142410	0.006874	1
891e2041db7ffff	0.444362	-0.293634	0.116565	0.298231	0.125056	-0.142197	0.051374	-0.331443	-0.068522	0.223158	0
891e2046667ffff	0.304934	-0.246910	-0.045896	0.301652	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146	0
891e2040d87ffff	0.277351	-0.265826	0.151163	0.511726	0.199198	-0.174101	-0.003378	-0.190494	0.032990	0.336151	0
...	...	...	...	...	...	...	...	...	...	...	...
891e2040693ffff	0.304934	-0.246910	-0.045896	0.301652	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146	0
891e2040eafffff	0.444362	-0.293634	0.116565	0.298231	0.125056	-0.142197	0.051374	-0.331443	-0.068522	0.223158	0
891e204062fffff	0.304934	-0.246910	-0.045896	0.301653	0.216143	-0.096599	-0.353328	-0.051583	-0.220259	0.349146	0
891e2042b03ffff	0.045778	0.063707	0.438936	0.573166	-0.174856	-0.000273	0.291727	-0.377283	0.402997	0.112393	4
891e204708fffff	-0.421047	0.041041	-0.354687	-0.915405	-0.086334	0.285789	-0.091117	0.487679	-0.223118	-0.399057	1

3168 rows × 11 columns

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plot_numeric_data(regions_gdf, "cluster", embeddings)
plot_numeric_data(regions_gdf, "cluster", embeddings)

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