Sure, here's a commented version of the code:

```python

# Create a list of unique tokens sorted in alphabetical order
# The list consists of:
#   - '<unk>' token
#   - reserved_tokens
#   - all tokens with frequency greater than or equal to min_freq
self.idx_to_token = list(sorted(set(
  ['<unk>'] + reserved_tokens + map(
    lambda token, _: token,
    # Filter out all tokens whose frequency is less than min_freq
    filter(
	  lambda _, freq: freq >= min_freq,
	  self.token_freqs
	)
  )
)))
```
Sure, here's a commented version of the code: ```python # Create a list of unique tokens sorted in alphabetical order # The list consists of: # - '<unk>' token # - reserved_tokens # - all tokens with frequency greater than or equal to min_freq self.idx_to_token = list(sorted(set( ['<unk>'] + reserved_tokens + map( lambda token, _: token, # Filter out all tokens whose frequency is less than min_freq filter( lambda _, freq : ความถี่ >= min_freq, self.token_freqs ) ) ))) ```
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