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Using the Edge Impulse Python SDK to upload and download data

If you want to upload files directly to an Edge Impulse project, we recommend using the CLI uploader tool. However, sometimes you cannot upload your samples directly, as you might need to convert the files to one of the accepted formats or modify the data prior to model training. Edge Impulse offers data augmentation for some types of projects, but you might want to create your own custom augmentation scheme. Or perhaps you want to generate synthetic data and script the upload process.

The Python SDK offers a set of functions to help you move data into and out of your project. This can be extremely helpful when generating or augmenting your dataset. The following cells demonstrate some of these upload and download functions.

You can find the API documentation for the functions found in this tutorial here.

WARNING: This notebook will add and delete data in your Edge Impulse project, so be careful! We recommend creating a throwaway project when testing this notebook.

Note that you might need to refresh the page with your Edge Impulse project to see the samples appear.

# If you have not done so already, install the following dependencies
!python -m pip install edgeimpulse
import edgeimpulse as ei

You will need to obtain an API key from an Edge Impulse project. Log into edgeimpulse.com and create a new project. Open the project, navigate to Dashboard and click on the Keys tab to view your API keys. Double-click on the API key to highlight it, right-click, and select Copy.

Note that you do not actually need to use the project in the Edge Impulse Studio. We just need the API Key.

Paste that API key string in the ei.API_KEY value in the following cell:

# Settings
ei.API_KEY = "ei_dae2..." # Change this to your Edge Impulse API key

Upload directory

You can upload all files in a directory using the Python SDK. Note that you can set the category, label, and metadata for all files with a single call. If you want to use a different label for each file set label=None in the function call and name your files with <label>.<name>.<ext>. For example, wave.01.csv will have the label wave when uploaded. See here for more information.

The following file formats are allowed: .cbor, .json, .csv, .wav, .jpg, .png, .mp4, .avi.

from datetime import datetime
# Download image files to use as an example dataset
!mkdir -p dataset
!wget -P dataset -q \
  https://raw.githubusercontent.com/edgeimpulse/notebooks/main/.assets/images/capacitor.01.png \
  https://raw.githubusercontent.com/edgeimpulse/notebooks/main/.assets/images/capacitor.02.png
# Upload the entire directory
response = ei.experimental.data.upload_directory(
    directory="dataset",
    category="training",
    label=None, # Will use the prefix before the '.' on each filename for the label
    metadata={
        "date": datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
        "source": "camera",
    }
)

# Check to make sure there were no failures
assert len(response.fails) == 0, "Could not upload some files"

# Save the sample IDs, as we will need these to retrieve file information and delete samples
ids = []
for sample in response.successes:
    ids.append(sample.sample_id)

# Review the sample IDs and get the associated server-side filename
# Note the lack of extension! Multiple samples on the server can have the same filename.
for id in ids:
    filename = ei.experimental.data.get_filename_by_id(id)
    print(f"Sample ID: {id}, filename: {filename}")

If you head to the Data acquisition page on your project, you should see images in your dataset.

Download files

You can download samples from your Edge Impulse project if you know the sample IDs. You can get sample IDs by calling the ei.data.get_sample_ids() function, which allows you to filter IDs based on filename, category, and label.

# Get sample IDs for everything in the "training" category
infos = ei.experimental.data.get_sample_ids(category="training")

# The SampleInfo should match what we uploaded earlier
ids = []
for info in infos:
    print(info)
    ids.append(info.sample_id)
# Download samples
samples = ei.experimental.data.download_samples_by_ids(ids)

# Save the downloaded files
for sample in samples:
    with open(sample.filename, "wb") as file:
        file.write(sample.data.read())

# View sample information
for sample in samples:
    print(
        f"filename: {sample.filename}\r\n"
        f"  sample ID: {sample.sample_id}\r\n"
        f"  category: {sample.category}\r\n"
        f"  label: {sample.label}\r\n"
        f"  bounding boxes: {sample.bounding_boxes}\r\n"
        f"  metadata: {sample.metadata}"
    )

Take a look at the files in this directory. You should see the downloaded images. They should match the images in the dataset/ directory, which were the original images that we uploaded.

Delete files

If you know the ID of the sample you would like to delete, you can call the delete_sample_by_id() function. You can also delete all the samples in your project by calling delete_all_samples().

# Delete the samples from the Edge Impulse project that we uploaded earlier
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

Take a look at the data in your project. The samples that we uploaded should be gone.

Upload folder for object detection

For object detection, you can put bounding box information (following the Edge Impulse JSON bounding box format) in a file named labels.info in that same directory.

Important! The annotations file must be named exactly labels.info

# Download images and bounding box annotations to use as an example dataset
!mkdir -p dataset
!rm dataset/capacitor.01.png dataset/capacitor.02.png
!wget -P dataset -q \
  https://raw.githubusercontent.com/edgeimpulse/notebooks/main/.assets/images/dog-ball-toy.01.png \
  https://raw.githubusercontent.com/edgeimpulse/notebooks/main/.assets/images/dog-ball-toy.02.png \
  https://raw.githubusercontent.com/edgeimpulse/notebooks/main/.assets/annotations/info.labels
# Upload the entire directory (including the labels.info file)
response = ei.experimental.data.upload_exported_dataset(
    directory="dataset",
)

# Check to make sure there were no failures
assert len(response.fails) == 0, "Could not upload some files"

# Save the sample IDs, as we will need these to retrieve file information and delete samples
ids = []
for sample in response.successes:
    ids.append(sample.sample_id)

If you head to the Data acquisition page on your project, you should see images in your dataset along with the bounding box information.

# Delete the samples from the Edge Impulse project that we uploaded
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

Upload individual CSV files

The Edge Impulse ingestion service accepts CSV files, which we can use to upload raw data. Note that if you configure a CSV template using the CSV Wizard, then the expected format of the CSV file might change. If you do not configure a CSV template, then the ingestion service expects CSV data to be in a particular format. See here for details about the default CSV format.

import csv
import io
import os
# Create example CSV data
sample_data = [
    [
        ["timestamp", "accX", "accY", "accZ"],
        [0, -9.81, 0.03, 0.21],
        [10, -9.83, 0.04, 0.27],
        [20, -9.12, 0.03, 0.23],
        [30, -9.14, 0.01, 0.25],
    ],
    [
        ["timestamp", "accX", "accY", "accZ"],
        [0, -9.56, 5.34, 1.21],
        [10, -9.43, 1.37, 1.27],
        [20, -9.22, -4.03, 1.23],
        [30, -9.50, -0.98, 1.25],
    ],
]

# Write to CSV files
filenames = [
    "001.csv",
    "002.csv"
]
for i, filename in enumerate(filenames):
    file_path = os.path.join("dataset", filename)
    with open(file_path, "w", newline="") as file:
        writer = csv.writer(file)
        writer.writerows(sample_data[i])
# Add metadata to the CSV data
my_samples = [
    {
        "filename": filenames[0],
        "data": open(os.path.join("dataset", filenames[0]), "rb"),
        "category": "training",
        "label": "idle",
        "metadata": {
            "source": "accelerometer",
            "collection site": "desk",
        },
    },
    {
        "filename": filenames[1],
        "data": open(os.path.join("dataset", filenames[1]), "rb"),
        "category": "training",
        "label": "wave",
        "metadata": {
            "source": "accelerometer",
            "collection site": "desk",
        },
    },
]
# Wrap the samples in instances of the Sample class
samples = [ei.experimental.data.Sample(**i) for i in my_samples]

# Upload samples to your project
response = ei.experimental.data.upload_samples(samples)

# Check to make sure there were no failures
assert len(response.fails) == 0, "Could not upload some files"

# Save the sample IDs, as we will need these to retrieve file information and delete samples
ids = []
for sample in response.successes:
    ids.append(sample.sample_id)

If you head to the Data acquisition page on your project, you should see your time series data.

# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

Upload JSON data directly

Another way to upload data is to encode it in JSON format. See the data acquisition format specificaion for more information on acceptable key/value pairs. Note that at this time, the signature value can be set to 0.

The raw data must be encoded in an IO object. We convert the dictionary objects to a BytesIO object, but you can also read in data from .json files.

import io
import json
# Create two different example data samples
sample_data_1 = {
    "protected": {
        "ver": "v1",
        "alg": "none",
    },
    "signature": 0,
    "payload": {
        "device_name": "ac:87:a3:0a:2d:1b",
        "device_type": "DISCO-L475VG-IOT01A",
        "interval_ms": 10,
        "sensors": [
            { "name": "accX", "units": "m/s2" },
            { "name": "accY", "units": "m/s2" },
            { "name": "accZ", "units": "m/s2" }
        ],
        "values": [
            [ -9.81, 0.03, 0.21 ],
            [ -9.83, 0.04, 0.27 ],
            [ -9.12, 0.03, 0.23 ],
            [ -9.14, 0.01, 0.25 ]
        ]
    }
}
sample_data_2 = {
    "protected": {
        "ver": "v1",
        "alg": "none",
    },
    "signature": 0,
    "payload": {
        "device_name": "ac:87:a3:0a:2d:1b",
        "device_type": "DISCO-L475VG-IOT01A",
        "interval_ms": 10,
        "sensors": [
            { "name": "accX", "units": "m/s2" },
            { "name": "accY", "units": "m/s2" },
            { "name": "accZ", "units": "m/s2" }
        ],
        "values": [
            [ -9.56, 5.34, 1.21 ],
            [ -9.43, 1.37, 1.27 ],
            [ -9.22, -4.03, 1.23 ],
            [ -9.50, -0.98, 1.25 ]
        ]
    }
}
# Provide a filename, category, label, and optional metadata for each sample
my_samples = [
    {
        "filename": "001.json",
        "data": io.BytesIO(json.dumps(sample_data_1).encode('utf-8')),
        "category": "training",
        "label": "idle",
        "metadata": {
            "source": "accelerometer",
            "collection site": "desk",
        },
    },
    {
        "filename": "002.json",
        "data": io.BytesIO(json.dumps(sample_data_2).encode('utf-8')),
        "category": "training",
        "label": "wave",
        "metadata": {
            "source": "accelerometer",
            "collection site": "desk",
        },
    },
]
# Wrap the samples in instances of the Sample class
samples = [ei.data.sample_type.Sample(**i) for i in my_samples]

# Upload samples to your project
response = ei.experimental.data.upload_samples(samples)

# Check to make sure there were no failures
assert len(response.fails) == 0, "Could not upload some files"

# Save the sample IDs, as we will need these to retrieve file information and delete samples
ids = []
for sample in response.successes:
    ids.append(sample.sample_id)

If you head to the Data acquisition page on your project, you should see your time series data.

# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

Upload NumPy arrays

NumPy is powerful Python library for working with large arrays and matrices. You can upload NumPy arrays directly into your Edge Impulse project. Note that the arrays are required to be in a particular format and must be uploaded some some required metadata (such as a list of labels and the sample rate).

Important! NumPy arrays must be in the shape (sample, time, sensor)

If you are working with image data in NumPy, we recommend saving those images as .png or .jpg files and using upload_directory().

import numpy as np
# Create example NumPy array with 2 time series samples
sample_data = np.array(
    [
        [ # Sample 1 ("idle")
            [-9.81, 0.03, 0.21],
            [-9.83, 0.04, 0.27],
            [-9.12, 0.03, 0.23],
            [-9.14, 0.01, 0.25],
        ],
        [ # Sample 2 ("wave")
            [-9.56, 5.34, 1.21],
            [-9.43, 1.37, 1.27],
            [-9.22, -4.03, 1.23],
            [-9.50, -0.98, 1.25],
        ],
    ]
)
# Labels for each sample
labels = ["idle", "wave"]

# Names of the sensors and units for the 3 axes
sensors = [
    { "name": "accX", "units": "m/s2" },
    { "name": "accY", "units": "m/s2" },
    { "name": "accZ", "units": "m/s2" },
]

# Optional metadata for all samples being uploaded
metadata = {
    "source": "accelerometer",
    "collection site": "desk",
}
# Upload samples to your project
response = ei.experimental.data.upload_numpy(
    data=sample_data,
    labels=labels,
    sensors=sensors,
    sample_rate_ms=10,
    metadata=metadata,
    category="training",
)

# Check to make sure there were no failures
assert len(response.fails) == 0, "Could not upload some files"

# Save the sample IDs, as we will need these to retrieve file information and delete samples
ids = []
for sample in response.successes:
    ids.append(sample.sample_id)

If you head to the Data acquisition page on your project, you should see your time series data. Note that the sample names are randomly assigned, so we recommend recording the sample IDs when you upload.

# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

Upload pandas (and pandas-like) dataframes

pandas is popular Python library for performing data manipulation and analysis. The Edge Impulse library supports a number of ways to upload dataframes. We will go over each format.

Note that several other packages exist that work as drop-in replacements for pandas. You can use these replacements so long as you import that with the name pd. For example, one of:

import pandas as pd
import modin.pandas as pd
import dask.dataframe as pd
import polars as pd
import pandas as pd

The first option is to upload one dataframe for each sample (non-time series)

# Construct one dataframe for each sample (multidimensional, non-time series)
df_1 = pd.DataFrame([[-9.81, 0.03, 0.21]], columns=["accX", "accY", "accZ"])
df_2 = pd.DataFrame([[-9.56, 5.34, 1.21]], columns=["accX", "accY", "accZ"])

# Optional metadata for all samples being uploaded
metadata = {
    "source": "accelerometer",
    "collection site": "desk",
}
# Upload the first sample
ids = []
response = ei.experimental.data.upload_pandas_sample(
    df_1,
    label="One",
    filename="001",
    metadata=metadata,
    category="training",
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)

# Upload the second sample
response = ei.experimental.data.upload_pandas_sample(
    df_2,
    label="Two",
    filename="002",
    metadata=metadata,
    category="training",
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)
# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

You can also upload one dataframe for each sample (time series). As with previous examples, we'll assume that the sample rate is 10 ms.

# Create samples (multidimensional, time series)
sample_data_1 = [ # Sample 1 ("idle")
    [-9.81, 0.03, 0.21],
    [-9.83, 0.04, 0.27],
    [-9.12, 0.03, 0.23],
    [-9.14, 0.01, 0.25],
]
sample_data_2 = [ # Sample 1 ("wave")
    [-9.56, 5.34, 1.21],
    [-9.43, 1.37, 1.27],
    [-9.22, -4.03, 1.23],
    [-9.50, -0.98, 1.25],
]
# Construct one dataframe for each sample
df_1 = pd.DataFrame(sample_data_1, columns=["accX", "accY", "accZ"])
df_2 = pd.DataFrame(sample_data_2, columns=["accX", "accY", "accZ"])

# Optional metadata for all samples being uploaded
metadata = {
    "source": "accelerometer",
    "collection site": "desk",
}
# Upload the first sample
ids = []
response = ei.experimental.data.upload_pandas_sample(
    df_1,
    label="Idle",
    filename="001",
    sample_rate_ms=10,
    metadata=metadata,
    category="training",
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)

# Upload the second sample
response = ei.experimental.data.upload_pandas_sample(
    df_2,
    label="Wave",
    filename="002",
    sample_rate_ms=10,
    metadata=metadata,
    category="training",
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)
# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

You can upload non-time series data where each sample is a row in the dataframe. Note that you need to provide labels in the rows.

# Construct non-time series data, where each row is a different sample
data = [
    ["desk", "training", "One", -9.81, 0.03, 0.21],
    ["field", "training", "Two", -9.56, 5.34, 1.21],
]
columns = ["loc", "category", "label", "accX", "accY", "accZ"]

# Wrap the data in a DataFrame
df = pd.DataFrame(data, columns=columns)
# Upload non-time series DataFrame (with multiple samples) to the project
ids = []
response = ei.experimental.data.upload_pandas_dataframe(
    df,
    feature_cols=["accX", "accY", "accZ"],
    label_col="label",
    category_col="category",
    metadata_cols=["loc"],
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)
# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

A "wide" dataframe is one where each column represents a value in the time series data, and the rows become individual samples. Note that you need to provide labels in the rows.

# Construct time series data, where each row is a different sample
data = [
    ["desk", "training", "idle", 0.8, 0.7, 0.8, 0.9, 0.8, 0.8, 0.7, 0.8],
    ["field", "training", "motion", 0.3, 0.9, 0.4, 0.6, 0.8, 0.9, 0.5, 0.4],
]
columns = ["loc", "category", "label", "0", "1", "2", "3", "4", "5", "6", "7"]

# Wrap the data in a DataFrame
df = pd.DataFrame(data, columns=columns)
# Upload time series DataFrame (with multiple samples) to the project
ids = []
response = ei.experimental.data.upload_pandas_dataframe_wide(
    df,
    label_col="label",
    category_col="category",
    metadata_cols=["loc"],
    data_col_start=3,
    sample_rate_ms=100,
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)
# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)

A DataFrame can also be divided into "groups" so you can upload multidimensional time series data.

# Create samples
sample_data = [
    ["desk", "sample 1", "training", "idle", 0, -9.81, 0.03, 0.21],
    ["desk", "sample 1", "training", "idle", 0.01, -9.83, 0.04, 0.27],
    ["desk", "sample 1", "training", "idle", 0.02, -9.12, 0.03, 0.23],
    ["desk", "sample 1", "training", "idle", 0.03, -9.14, 0.01, 0.25],
    ["field", "sample 2", "training", "wave", 0, -9.56, 5.34, 1.21],
    ["field", "sample 2", "training", "wave", 0.01, -9.43, 1.37, 1.27],
    ["field", "sample 2", "training", "wave", 0.02, -9.22, -4.03, 1.23],
    ["field", "sample 2", "training", "wave", 0.03, -9.50, -0.98, 1.25],
]
columns = ["loc", "sample_name", "category", "label", "timestamp", "accX", "accY", "accZ"]

# Wrap the data in a DataFrame
df = pd.DataFrame(sample_data, columns=columns)
# Upload time series DataFrame (with multiple samples and multiple dimensions) to the project
ids = []
response = ei.experimental.data.upload_pandas_dataframe_with_group(
    df,
    group_by="sample_name",
    timestamp_col="timestamp",
    feature_cols=["accX", "accY", "accZ"],
    label_col="label",
    category_col="category",
    metadata_cols=["loc"]
)
assert len(response.fails) == 0, "Could not upload some files"
for sample in response.successes:
    ids.append(sample.sample_id)
# Delete the samples from the Edge Impulse project
for id in ids:
    ei.experimental.data.delete_sample_by_id(id)
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