I can provide you with the steps you can follow to generate a Base64 code for a 64 by 64 px image of a sign with the words 'deep learning' in Python.

1. Use a graphics library like Pillow to create a blank image of size 64x64 pixels.
2. Use a font library like Pygame or FreeType to add the text 'deep learning' to the image.
3. Save the image to a file in a suitable format like PNG or JPEG.
4. Use the base64 library in Python to encode the image file as a Base64 string.

Here is some example code that you can use as a starting point:


```python
from PIL import Image, ImageDraw, ImageFont
import base64

# Create a blank image
img = Image.new('RGB', (64, 64), color = (255, 255, 255))

# Add text to the image
draw = ImageDraw.Draw(img)

# You may need to adjust the font size and position to fit the text onto the image.
font = ImageFont.truetype('arial.ttf', 8)
draw.text((10, 25), 'deep learning', font=font, fill=(0, 0, 0))

# Save the image to a file
img.save('sign.png')

# Encode the image file as a Base64 string
with open('sign.png', 'rb') as f:
    img_data = f.read()
    encoded_img = base64.b64encode(img_data)
    print(encoded_img)
```
Note that you may need to adjust the font size and position to fit the text, as this is a relatively small image size.
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